Publications

2024

216.  Stress-Alteration Enhancement of the Reactivity of Aluminum Nanoparticles in the Catalytic Decomposition of exo-Tetrahydrodicyclopentadiene (JP-10). S. Biswas, D. Paul, N. Dias,  K. Kuntzler, M. Ahmed, M.L. Pantoya, R.I. Kaiser. JPCA (2024)

215. An experimental and computational view of the photoionization of diol-water clusters. A. Wannenmacher, W. Lu, C. Amarasinghe, F. Cerasoli, D. Donadio, M. Ahmed. J. Chem. Phys. (2024)

214. Interfacial Nanostructure and Hydrogen Bond Networks of Choline Chloride and Glycerol Mixtures Probed with X-ray and Vibrational Spectroscopies. P. Kim, C. Weeraratna, S. Nemsak, N. Dias, A.K. Leemens, K.R. Wilson, M. Ahmed. JPC Lett (2024)

213. Efficient Oxidative Decomposition of Jet-Fuel exo- Tetrahydrodicyclopentadiene (JP-10) by Aluminum Nanoparticles in a Catalytic Microreactor: An Online Vacuum Ultraviolet Photoionization Study. S. Biswas, D. Paul, N. Dias,  W. Lu, M. Ahmed, M.L. Pantoya, R.I. Kaiser. JPCA (2024)

2023

212. Counterintuitive Catalytic Reactivity of the Aluminum Oxide Passivation” Shell of Aluminum Nanoparticles Facilitating the Thermal Decomposition of exo-Tetrahydrodicyclopentadiene (JP-10) S. Biswas, D. Paul, C. He, N. Dias, M. Ahmed, M.L. Pantoya, R.I. Kaiser. JPC Lett (2023)

211. Probing Complex Chemical Systems at the Molecular Level with Vibrational Spectroscopy & X-Ray Tools . M. Ahmed and W. Lu. JPC Lett (2023)

210. Gas-phase formation of the resonantly stabilized 1-indenyl (C9H7•) radical in the interstellar medium, Z. Yang, G.R. Galimova, C. He, S.J. Goettl, D. Paul, W. Lu, M. Ahmed, A.M. Mebel, X. Li, & R.I. Kaiser. Science Advances (2023)

209. Magic Numbers and Stabilities of Photoionized Water Clusters: Computational and Experimental Characterization of the Nanosolvated Hydronium Ion. C. J. Mackie,  W. Lu,  J. Liang, O. Kostko, B. Bandyopadhyay, I. Gupta, M. Ahmed, M. Head-Gordon, J. Phys. Chem. A (2023)

208. Unconventional Gas-Phase Preparation of the Prototype Polycyclic Aromatic Hydrocarbon Naphthalene (C10H8) via the Reaction of Benzyl (C7H7) and Propargyl (C3H3) Radicals Coupled with Hydrogen-Atom Assisted Isomerization. C. He,   R. I. Kaiser,   W. Lu,   M. Ahmed,   V. S. Krasnoukhov,   P. S. Pivovarov,   M. V. Zagidullin,   V. N. Azyazov,   A. N. Morozov  and  A. Mebel. Chemical Science (2023)  

207. Constraining the Reaction Rate of Criegee Intermediates with Carboxylic Acids during the Multiphase Ozonolysis of Aerosolized Alkenes, R. Reynolds, M. Ahmed, K. R. Wilson. ACS Earth & Space Chem. (2023)

206. Fraction of Free-Base Nicotine in Simulated Vaping Aerosol Particles Determined by X‑ray Spectroscopies, C. Weeraratna, X. Tang, O. Kostko, V. H. Rapp, L. A. Gundel, H. Destaillats, M. Ahmed. JPC Lett (2023)

205. Exotic Reaction Dynamics in the Gas-Phase Preparation of Anthracene (C14H10) via Spiroaromatic Radical Transients in the Indenyl–Cyclopentadienyl Radical–Radical Reaction, C. He, R. I. Kaiser, W. Lu, M. Ahmed, Y. Reyes, S.F. Wnuk, A. M. Mebel, JACS (2023)

204. Unconventional Pathway in the Gas-Phase Synthesis of 9H-Fluorene (C13H10) via the Radical – Radical Reaction of Benzyl (C7H7) with Phenyl (C6H5), C. He, R. I. Kaiser, W. Lu, M. Ahmed, P. S. Pivovarov, O. V. Kuznetsov, M. V. Zagidullin, and A. M. Mebel, Angew Chem (2023)

2022

203.  Water Confinement in Small Polycylic Aromatic Hydrocarbons, A. Zamir, E.S. Molina, M. Ahmed, T. Stein, PCCP (2022)

202. Probing Growth of Metal–Organic Frameworks with X-Ray Scattering and Vibrational Spectroscopy, W. Lu, E. Zhang, J. Qian, C. Weeraratna, M. Jackson, C. Zhu, J.R. Long, M. Ahmed. PCCP (2022)

201. Gas Phase Synthesis of Racemic Helicenes and their potential role in Enantiomeric Enrichments of Sugar and Amino Acids in Meteorites. R. I. Kaiser, L. Zhao, W. Lu, M. Ahmed, M. M. Evseev, V. N. Azyazov, A. M. Mebel, R. K. Mohamed, F. R. Fischer, X. Li PCCP (2022)

200.  A Combined Theoretical and Experimental Study of Small Anthracene-Water Clusters, E.E. R. Molina, B. Xu, O. Kostko, M. Ahmed & T. Stein. PCCP (2022)

199. Probing Hydrogen-Bond Networks in Plastic Crystals with Terahertz and Infrared Spectroscopy. Lu, W.; Zhang, E.; Amarasinghe, C.; Martin, A.; Kaur, S.; Prasher, R. & Ahmed, M.  Cell Rep. Phys. Sci. (2022). 

198.  Computational and Experimental View of Hydrogen Bonding in Glycerol Water Clusters, W. Lu, C. J. Mackie, B. Xu, M. Head-Gordon, M. Ahmed. JPCA (2022)

197. Unconventional excited-state dynamics in the concerted benzyl (C7H7) radical self-reaction to anthracene (C14H10), R. I. Kaiser, L. Zhao, W. Lu, M. Ahmed, V. S. Krasnoukhov, V. N. Azyazov, A. M. Mebel. Nature Comm (2022)

196. Formation of Benzene and Naphthalene through Cyclopentadienyl-Mediated Radical–Radical Reactions, R. I. Kaiser, L. Zhao, W. Lu, M. Ahmed, M. V. Zagidullin, V. N. Azyazov, A. M. Mebel. J. Phys. Chem, Lett (2022)

2021

195. An Investigation of Aqueous Ammonium Nitrate Aerosols with Soft X-ray Spectroscopy, C. Weeraratna, O. Kostko, M. Ahmed, Molecular Physics (2021)

194. Molecular Properties and Chemical Transformations Near Interfaces, M. Ahmed, M. Blum, E. J. Crumlin, P. L. Geissler, T. Head-Gordon, D. T. Limmer, K. K. Mandadapu, R. J. Saykally, K. R. Wilson. JPCB (2021)

193. A Molecular Beams and Computational Study on the Barrierless Gas Phase Formation of (Iso)Quinoline in Low Temperature Extraterrestrial Environments, L. Zhao, M. Prendergast, R. I. Kaiser, B. Xu, W. Lu, M. Ahmed, A. H. Howlader, S. F. Wunk, A. S. Korotchenko, M. M. Evseev, E. K. Bashkirov, V. N. Azyazov, A. Mebel. PCCP (2021)

192. A Direct Probe of the Hydrogen Bond Network in Aqueous Glycerol  Aerosols, C. Weeraratna, C. Amarasinghe, W. Lu, M. Ahmed, J. Phys. Chem. Lett. (2021)

191. Gas-phase synthesis of benzene via the propargyl radical self-reaction, L. Zhao, W. Lu, M. Ahmed, M. V. Zagidullin, V. N. Azyazov, A. N. Morozov, A. M. Mebel, R. I. Kaiser, Science Advances (2021)

190. Local electronic structure of histidine in aqueous solution, O. Kostko, B. Xu, and M. Ahmed, PCCP (2021)

189.  Studying Interfacial Dark Reactions of Glyoxal and Hydrogen Peroxide Using Vacuum Ultraviolet Single Photon Ionization Mass Spectrometry, X. Sui, B. Xu, J. Yao, O. Kostko, M. Ahmed, and X-Y. Yu, Atmosphere (2021)

188. Gas-Phase Synthesis of Corannulene – A Molecular Building Block of Fullerenes, L. Zhao,   S. Doddipatla,   R. I. Kaiser,   W. Lu,   O. Kostko,   M. Ahmed,   L. B. Tuli,   A. N. Morozov,   A. H. Howlader,   S. F. Wnuk,   A. Mebel,   V. N. Azyazov,   R. K. Mohamed  and  F. Fischer. PCCP (2021)  

187. New Insights into Secondary Organic Aerosol Formation at the Air−Liquid Interface, X. Sui, B. Xu, J. Yao, O. Kostko, M. Ahmed, and X-Y. Yu, J. Phys. Chem. Lett (2021).

2020

186.  Probing self-assembly in arginine-oleic acid solutions with terahertz spectroscopy and X-ray scattering. W. Lu, E. Zhang, C. Amarasinghe, O. Kostko, and M. Ahmed. J. Phys. Chem. Lett (2020)

185.  Water freezes at near-zero temperatures using carbon nanotube based electrodes under static electric fields. Z. Huang, S. Kaur, M. Ahmed, and R. Prasher,  ACS Applied Materials and Interfaces (2020)

184. Gas Phase Formation of Cyclopentanaphthalene (Benzindene) Isomers via Reactions of 5- and 6-Indenyl Radicals with Vinylacetylene,  L. Zhao, R. I. Kaiser, W. Lu, O. Kostko,  M. Ahmed,  M. M. Evseev, E. K. Bashkirov, A. D. Oleinikov, V. N. Azyazov, A. M. Mebel, A. H. Howlader, S. F. Wnuk. PCCP (2020)

183. Gas Phase Formation of Phenalene via 10π-Aromatic, Resonantly Stabilized Free Radical Intermediates, L. Zhao, R. I. Kaiser, W. Lu, M. Ahmed, A. D. Oleinikov, V. N. Azyazov, A. M. Mebel, A. H. Howlader, S. F. Wnuk. PCCP (2020)

182. Probing sulphur clusters in a microfluidic electrochemical cell with synchrotron-based photoionization mass spectrometry. R.l Komorek, B. Xu, J. Yao, O. Kostko, M. Ahmed, X-Y Yu. PCCP (2020)

181. Exciton Energy Transfer Reveals Spectral Signatures of Excited States in Clusters. W. Lu. R. B. Metz, T. P. Troy, O. Kostko, M. Ahmed. PCCP (2020)

180. Determination of effective attenuation length of slow electrons in polymer films. J. H. Ma, P. Naulleau, M. Ahmed, O. Kostko, J. Appl. Phys. (2020)

179. Nucleation of Soot: Experimental Assessment of the Role of  Polycyclic Aromatic Hydrocarbon (PAH) Dimers. B. A, Adamson, S. A. Skeen, M. Ahmed, N. Hansen,  Z Phys Chem (2020)

178.  A Free Radical Prompted Barrierless Gas Phase Synthesis of Pentacene. A. Mebel,   L. Zhao,   R. I. Kaiser,  W. Lu,  M. Ahmed,  M. M. Evseev,  E. K. Bashkirov,  V. N. Azyazov,  C, Tönshoff,  F. Reicherter,  H. F. Bettinger,  Angew Chem (2020)

177. From atoms to aerosols: Probing clusters and nanoparticles with synchrotron based mass spectrometry and X-ray spectroscopy. M. Ahmed, O. Kostko, PCCP,  (2020)

176.  A Unified Mechanism on the Formation of Acenes, Helicenes, and Phenacenes in the Gas Phase, L. Zhao, R. I. Kaiser,U. Ablikim,  B. Xu, M. Ahmed,  M. M. Evseev, E. K. Bashkirov, V. N. Azyazov, A. M. Mebel, Angew. Chem.  (2020)

2019

175.  Velocity map imaging of inelastic and elastic low energy electron scattering in organic nanoparticles, O. Kostko, M. I. Jacobs, B. Xu, K. R. Wilson, M. Ahmed,  J. Chem. Phys. (2019)

174. Synthesis of Microporous Silica Nanoparticles to Study Water Phase Transitions by Vibrational Spectroscopy ,  D.J. Rosenberg, S. Alayoglu, R. Kostecki, M. Ahmed, Nanoscale Advances (2019)

173.  Synthesis of Polycyclic Aromatic Hydrocarbons via Phenyl Addition – Dehydrocyclization: The Third Way , L. Zhao, M. Prendergast, R. I. Kaiser, B. Xu, U. Ablikim, M. Ahmed, B-J. Sun, Y-L. Chen, A. H.H. Chang, R. K. Mohamed, and F. R. Fischer, Angew. Chem. (2019) 

172. Molecular Mass Growth through Ring Expansion in Polycyclic Aromatic Hydrocarbons via Radical-Radical Reactions. L. Zhao, R. I. Kaiser, W. Lu, B. Xu, M. Ahmed, A. N. Morozov, A. M. Mebel, A. Hasan Howlader, S. F. Wnuk,  Nature Communications (2019)

171. How to Add a Five-Membered Ring to Polycyclic Aromatic Hydrocarbons (PAHs) – Molecular Mass Growth of the 2-Naphthyl Radical (C10H7) to Benzindenes (C13H10) as a Case Study. L. Zhao, M.B. Prendergast, R.I. Kaiser, B. Xu, W. Lu, U. Ablikim, M. Ahmed, A. D. Oleinikov, V. N. Azyazov, A.H. Howlader, S. F. Wnuk, A.M. Mebel.  PCCP (2019)

170. Using Nanoparticle X-ray Spectroscopy to Probe the Formation of Reactive Chemical Gradients in Diffusion-Limited Aerosols. M. I. Jacobs, B. Xu, O. Kostko, A. A. Wiegel, F. A. Houle, M. Ahmed, and K. R. Wilson. J. Phys. Chem. A (2019)

169. Gas phase synthesis of [4]-helicene, L. Zhao, R. I. Kaiser, B. Xu, U. Ablikim, W. Lu, M. Ahmed, M. M. Evseev, E. K. Bashkirov, V. N. Azyazov, M. V. Zagidullin, A. N. Morozov, A. Hasan Howlader, S. F. Wnuk, A. M. Mebel, D. Joshi, G. Veber & F. R. Fischer, Nature Communications (2019)

168. Reactivity of the Indenyl Radical (C₉H₇) with Acetylene (C₂H₂) and Vinylacetylene (C₄H₄),  L. Zhao,  M. B. Prendergast,  R. I. Kaiser,  B. Xu,  W. Lu,  U. Ablikim,  M. Ahmed,  A. D. Oleinikov,  V. N. Azyazov,  A. M. Mebel, ChemPhysChem (2019) 

167. To Be or Not to Be a Molecular Ion: The Role of Solvent in Photoionization of Arginine. A. Barrozo, B. Xu, A. O. Gunina, M. I. Jacobs, K. R. Wilson, O. Kostko, M. Ahmed,  A. I. Krylov, J. Phys. Chem. Lett (2019)

166.  Probing Reactivity of Gold Atoms with Acetylene and Ethylene with VUV Photoionization Mass Spectrometry and Ab Initio Studies. R.B. Metz, A. Gokhan, O.Kostko,  M. Ahmed, J. Phys. Chem. A (2019)

165. Gas Phase Synthesis of Triphenylene (C₁₈H₁₂). L. Zhao, B. Xu, U. Ablikim, W. Lu, M. Ahmed, M.M. Evseev, E.K. Bashkirov, V. N. Azyazov, A.Morozov, A.H. Howlader, S. Wnuk, A. Mebel, R.I. Kaiser, Chem. Phys. Chem. 20, 791 (2019)

164. Probing solvation and reactivity in polycyclic aromatic hydrocarbon-water clusters with Photoionization Mass Spectrometry and Ab Initio Studies. B. Xu, T. Stein, U. Ablikim, L. Jiang,  J. Hendrix, M. Head-Gordon, M. Ahmed,  Faraday Discussions (2019)

2018

163. Room-temperature cycling of metal fluoride electrodes: Liquid electrolytes for high-energy fluoride ion cells. V. K. Davis, C. M. Bates, K. Omichi, B. M. Savoie, N. Momčilović, Q. Xu, W. J. Wolf, M. A. Webb, K. J. Billings, N. H. Chou, S. Alayoglu, R. K. McKenney, I. M. Darolles, N. G. Nair, A. Hightower, D. Rosenberg, M. Ahmed, C. J. Brooks, T. F. Miller III, R. H. Grubbs, S. C. Jones, Science 362, 1144 (2018)

162. Detection of Aliphatically Bridged Multi-Core Polycyclic Aromatic Hydrocarbons in Sooting Flames with Atmospheric-Sampling High-Resolution Tandem Mass Spectrometry. B. D. Adamson, S. A. Skeen, M. Ahmed, N. Hansen,   J. Phys. Chem. A, 122, 9338 (2018) 

161. Functional Relationships between Kinetic, Flow, and Geometrical Parameters in a High Temperature Chemical Micro-Reactor, M. V. Zagidullin, R. I. Kaiser, D.Porfiriev, I. P. Zavershinskiy, M. Ahmed, V. N. Azyazov,  A. M. Mebel,  J. Phys. Chem. A, 122, 8819 (2018)

160. Enabling liquid vapor analysis using synchrotron VUV single photon ionization mass spectrometry with a microfluidic interface. R. Komorek, B. Xu, J. Yao, U. Ablikim, T. P. Troy, O. Kostko, M. Ahmed, X-Y. Yu,  Rev. Sci. Instrum. 89, 115105 (2018)

159. Fundamental understanding of chemical processes in extreme ultraviolet resist materials, O. Kostko, B. Xu. M. Ahmed, D. S, Slaughter, D. F. Ogletree, K. D. Closer, D. G. Prendergast, P. Naulleau, D. L. Olynick, P. D. Ashby, W. D. Hinsberg, and G. M. Wallraff.  J. Chem. Phys. 2018, 149, 154305 (2018)

158. Low-Temperature Formation of Polycyclic Aromatic Hydrocarbons in Titan’s Atmosphere, Zhao, L.; Kaiser, R. I.; Xu, B.; Ablikim, U.; Ahmed, M.; Evseev, M. M.; Bashkirov, E. K.; Aztazov, V. N.; Mebel, A. M.,.  Nature Astronomy (2018) LBNL story on this

157. Thermal Decompositions of the Lignin Monomers Salicylaldehyde and Catechol, T. K. Ormond, A. M. Scheer, P. Hemberger, T. P. Troy, M. Ahmed, M. R. Nimlos, D. J. Robichaud, J. W. Daily, J. F. Stanton, and G. B. Ellison,  J. Phys. Chem. A, 122, 5911 (2018)

156. Carbon and Oxygen Isotopic Fractionation in the products of low-temperature VUV photodissociation of Carbon Monoxide. S. Chakraborty, B. Rude, M. Ahmed,  M. Thiemens, Chem. Phys. Chem. Phys. 514, 78, (2018)

155.  A VUV Photoionization Study on the Formation of the Simplest Polycyclic Aromatic Hydrocarbon: Naphthalene (C10H8).  L. Zhao, R.I. Kaiser, B. Xu, U. Ablikim, M. Ahmed, M.V, Zagidullin, V. N. Azyazov, A. S. Howlader, S. F. Wnuk,  A. M. Mebel, J. Phys. Chem. Lett (2018)

154. Pyrene synthesis in circumstellar envelopes and its role in the formation of 2D nanostructures.  L. Zhao, R.I. Kaiser, B. Xu, U. Ablikim, M. Ahmed, D. Joshi, G. Veber, F. R. Fischer, A. M. Mebel, Nature Astronomy (2018)         LBNL story on this

153.  Differential capacity of kaolinite and birnessite to protect surface associated proteins against thermal degradation S. S. Chacon, M. García-Jaramillo, S.Y. Liu, M. Ahmed, M. Kleber, Soil Biol. Biochem. (2018) 119, 101-109 

152. A Vacuum Ultraviolet Photoionization Study on the Thermal Decomposition of Ammonium Perchlorate. S. Gobi, L. Zhao, B. Xu, U. Ablikim, M. Ahmed, R.I. Kaiser, Chem. Phys. Lett. (2018) 691 250-257 

2017

151. Two Coexisting Liquid Phases in Switchable Ionic Liquids.  J. Yao,  D. Lao,  X. Sui,  Y. Zhou,  S. K. Nune,  X. Ma,  T. P. Troy,  M. Ahmed,  Z. Zhu,  D. J. Heldebrant  and  X-Y Yu   Phys. Chem. Chem. Phys., 2017,19, 22627-22632

150. Ab initio dynamics and photoionization mass spectrometry reveal ion-molecule pathways from ionized acetylene clusters to benzene cation. T. Stein, B. Bandyopadhyay, T. P. Troy, Y. Fang, O. Kostko, M. Ahmed & M. H. Gordon. PNAS 114, E4125 (2017)

149. Low Energy Electron Attenuation Lengths in Core-Shell Nanoparticles, M.I. Jacobs, O. Kostko, M. Ahmed, K. R. Wilson. PCCP 19, 13372 (2017) 

148. Soft X-Ray spectroscopy of nanoparticles by velocity map imaging, O. Kostko, B. Xu, M. I. Jacobs, & M. Ahmed. J. Chem. Phys. 147, 013931 (2017)

147. A Vacuum Ultraviolet Photoionization Study on High-Temperature Decomposition of JP-10 (exo-Tetrahydrodicyclopentadiene) L. Zhao, T. Yang, R.I. Kaiser, T. P. Troy, B. Xu,  M. Ahmed, J. Alarcon, D. Belisario-Lara, A. M. Mebel, Y. Zhang, C. Cao, J. Zou. PCCP 2017,19, 15780-15807

146. HACA's heritage, A free-radical pathway to Phenanthrene in circumstellar envelopes of asymptotic giant branch stars. T. Yang, R.I. Kaiser, T. P. Troy, B. Xu, O. Kostko, M. Ahmed, A. M. Mebel, M.V. Zagidullin, V.N. Azyazov, Angew. Chem. 56, 4515 (2017)

145. A Guanidinium Group is protonated in a strongly basic arginine solution.  B. Xu, M. I. Jacobs, O. Kostko M. Ahmed, Chem. Phys. Chem. 18, 1503 (2017)

144. A Combined Experimental and Computational Study on the Unimolecular Decomposition of JP-8 Jet Fuel Surrogates I: n-Decane (n-C10H22).  L. Zhao, T. Yang, R. I. Kaiser, T. P. Troy, M. Ahmed, J. M. Ribeiro, D. Belisario-Lara, and A. M. Mebel, J. Phys. Chem. A 121, 1281 (2017)

143. A Combined Experimental and Computational Study on the Unimolecular Decomposition of JP-8 Jet Fuel Surrogates I: n-Decane (n-C10H22).  L. Zhao, T. Yang, R. I. Kaiser, T. P. Troy, M. Ahmed, J. M. Ribeiro, D. Belisario-Lara, and A. M. Mebel, ,  J. Phys. Chem. A 121, 1261 (2017)

 2016

142. Hydrogen-Abstraction/Acetylene-Addition Exposed.  T. Yang, T. P. Troy, B. Xu, O. Kostko, M. Ahmed, A. M. Mebel, R.I. Kaiser,  Angew. Chem. (2016) 55, 14983

141. Probing the heterogeneous ozonolysis of squalene nanoparticles by photoemission.  M.I. Jacobs, B. Xu, O. Kostko, N. Heine,  M. Ahmed & K. R. Wilson, J. Phys. Chem. A, (2016) 120, 8645

140. Probing the Microhydration of Metal Carbonyl: A Photoelectron Velocity-Map Imaging Spectroscopic and Theoretical Study of Ni(CO)3(H2O)n– H. Xie, J. Zou, X. Kong, W. Zhang, M. Ahmed & L. Jiang. PCCP (2016) 18, 26719

139. Proton transfer in acetaldehyde–water clusters mediated by a single water molecule, O. Kostko, B. Bandyopadhyay, T.P. Troy & M. Ahmed. PCCP 18, 25569 (2016)

138. Nitrogen isotopic fractionations in the low temperature (80K) vacuum ultraviolet photodissociation of N2,  S. Chakraborty, T. L. Jackson, B. Rude, M. Ahmed, and M. Thiemens. J. Chem. Phys. 145, 114302 (2016)

137. VUV and XUV reflectance of optically coated mirrors for selection of high harmonics , K. A. Larsen, J. P. Cryan, N. Shivaram, E. G. Champenois, T. W. Wright, D. Ray, O. Kostko, M. Ahmed, A. Belkacem, and D. S. Slaughter. Opt. Express 24, 18209-18216 (2016)

136. DSMC Simulations of a Photoionization Mass Spectrometer, Q. Guan, G. B. Ellison, J. F. Stanton,  M. Ahmed,  and J. Daily, 54th AIAA Aerospace Science Meeting (2016)

135. The Thermal Decomposition of the Benzyl Radical in a Heated Micro-Reactor: II. Pyrolysis of the tropyl radical, G. Buckingham,  J. Porterfield, O. Kostko, T. P. Troy, M. Ahmed, D. J. Robichaud, M. Nimlos, J. Daily, and G. B. Ellison, J.Chem. Phys. 145, 014305 (2016)

134. Probing Ionic Complexes of Ethylene and Acetylene with Vacuum Ultraviolet Radiation,  B. Bandyopadhyay, T. Stein, Y. Fang, O. Kostko, A. White, M. H. Gordon &  M. Ahmed. J. Phys. Chem. A, 120 505 (2016)

133. Pyrolysis of the Simplest Carbohydrate, Glycolaldehyde (CHO-CH2OH), and Glyoxal in a Heated Micro-Reactor. J. P. Porterfield,J. H. Baraban, T. P. Troy, M. Ahmed, M. C. McCarthy, K. M. Morgan,   J. W. Daily, T. L. Nguyen, J. F. Stanton, & G. B. Ellison. J. Phys. Chem. A 120, 2161, (2016)

132. Hydrothermal Synthesis and Characterization under Dynamic Conditions of Cobalt Oxide Nanoparticles Supported over Magnesium Oxide Nano-plates  S. Alayoglu, D. Rosenberg & M. Ahmed.  Dalton Trans. 45, 9932, (2016)

131. Vacuum Ultraviolet Photoionization of complex chemical systems.  O. Kostko, B. Bandyopadhyay, &  M. Ahmed, Ann. Rev. Phys. Chem. 67, 19 (2016)

130. Soft X-ray Spectroscopy Studies of Adsorption and Reaction of CO in the presence of H2 over 6 nm MnO Nanoparticles Supported on Mesoporous Co3O4. W. T. Ralston, N. Musselwhite, G. Kennedy, K. Ana,Y. Horowitz, A. A. Cordones, B. Rude, M. Ahmed, G. Melaet,  & S. Alayoglu, Surface Science 648, 14 (2016)

2015

129. Isomerization and fragmentation of Cyclohexanone in a heated micro-reactor. J. P. Porterfield, T. L. Nguyen, J. H. Baraban, G. T. Buckingham, T. P. Troy, O. Kostko, M. Ahmed, J. F. Stanton, J. W. Daily, & G. B. Ellison. J. Phys. Chem. A 119 12635 (2015)

128. On the formation of pyridine in the interstellar medium.  D. S. N. Parker, R. I. Kaiser, O. Kostko, T. P. Troy,  M. Ahmed, B. J. Sun, S. H. Chen & A. H. Chang. Phys. Chem. Chem. Phys. 17, 32000 (2015)  

127. Pyrolysis Pathways of the Furanic Ether 2-Methoxyfuran. K. N. Urness, Q. Guan, T. P. Troy, M. Ahmed, J. W. Daily, G. B. Ellison, and J. M. Simmie. J. Phys. Chem. A (2015)

126. S-layers at second glance? Altiarchaeal grappling hooks (hami) resemble archaeal S-layer proteins in structure and sequence.  A. K. Perras, B. Daum, C. Ziegler, L.K. Takahashi, M. Ahmed, G. Wanner, A. Klingl, G. Leitinger, D. Kolb-Lenz, S. Gribaldo, A. Auerbach, M. Mora, A. J. Probst, A. Bellack, C. Moissl-Eichinger, Frontiers in Microbiology 6, 543 (2015)

125. Selective Formation of Indene via the Reaction of Benzyl Radicals with Acetylene,  D. S. N. Parker, R. I. Kaiser, O. Kostko, & M. Ahmed, ChemPhysChem 16, 2091 (2015)

124. Probing Methanol Cluster Growth by Vacuum Ultraviolet Ionization,  B. Bandyopadhyay, O. Kostko, Y. Fang, &  M. Ahmed. J. Phys. Chem. A 119, 4083 (2015)

123. Understanding the Growth Mechanisms of Ag Nanoparticles Controlled by Plasmon-Induced Charge Transfers in Ag-TiO2 Films. Z. Liu, N. Destouches, G. Vitrant, Y. Lefkir, T. Epicier, F. Vocanson, S. Bakhti, Y. Fang, B. Bandyopadhyay, &  M. Ahmed,  J. Phys. Chem. C 119, 9496, (2015)

122. The Ionization Energy of Cyclopentadienone: A Photoelectron-Photoion Coincidence Study.  T. K. Ormond, P. Hemberger, T. P. Troy, M Ahmed, J. F. Stanton,and G. B. Ellison,  Mol. Phys. 113, 2350 (2015)

121. Rings of fire: Carbon combustion from soot to stars. T. P. Troy and M. Ahmed,  Physics Today. 68, 62 (2015)

120. Unexpected Chemistry from the Reaction of Naphthyl plus Acetylene Molecules. D. S. N. Parker, R. I. Kaiser, O. Kostko, T. P. Troy, & M. Ahmed,  Angew. Chem. 54, 5421, (2015)

65. O. Kostko, S.K. Kim, S.R. Leone, and M. Ahmed, “Mass-Analyzed Threshold Ionization (MATI) Spectroscopy of Atoms and Molecules using VUV Synchrotron Radiation” J. Phys. Chem. A (2009) 113, 14206

64. D.L. Che, J. D. Smith, S. R. Leone, M. Ahmed and K. R. Wilson, “Quantifying the Reactive Uptake of OH by Organic Aerosols in a Continuous Flow Stirred Tank Reactor” Phys. Chem. Chem. Phys. (2009) 11, 7885

63.  S. Chakraborty, M. Ahmed, T. L. Jackson and M. H. Thiemens. “Response to the Comment on “Experimental Test of Self-shielding in Vacuum Ultraviolet Photodissociation of CO” Science (2009) 324, 1516-d

62. J. Zhou, O. Kostko, C. Nicolas, X. Tang, L. Belau, M. S. de Vries, and M. Ahmed, “The direct observation of guanine tautomers using VUV photoionization”  J. Phys. Chem. A (2009) 113, 4829

61. J. D. Smith, J. H. Kroll, C. D. Cappa, D. L. Che, M. Ahmed, S. R. Leone, D. R. Worsnop, and K. R. Wilson. “The heterogeneous reaction of hydroxyl radicals with sub-micron squalane particles: a model system for understanding the oxidative aging of ambient aerosols” Atmos. Chem. Phys. (2009) 9, 3209

60. L. Takahashi, J. Zhou, K. R. Wilson, S. R. Leone and M. Ahmed, “Imaging with Mass Spectrometry: A Secondary Ion and VUV-Photoionization Study of Ion-Sputtered Atoms and Clusters from GaAs and Au” J. Phys. Chem. A (2009) 113, 4035

59. O. Kostko, M. Ahmed, and R. B. Metz, “A VUV photoionization measurement and ab-initio calculation of the ionization energy of gas phase SiO2  J. Phys. Chem. A (2009) 113, 1225

2008

58. D. L. Osborn, P. Zou, H. Johnsen, C. C. Hayden, C. A. Taatjes, V. D. Knyazev, S. W. North, D. S. Peterka, M. Ahmed, and S. R. Leone. “The multiplexed chemical kinetic photoionization mass spectrometer:  a new approach to isomer-resolved chemical kinetics.” Rev. Sci. Instrum. 79, (2008) 104103

57. M. Citir, R.B. Metz, L. Belau, and M. Ahmed. “Direct determination of the ionization energies of PtC, PtO and PTO2 with VUV radiation” J. Phys. Chem. A 112, (2008) 9584

56. O. Kostko, L. Belau, K.R. Wilson and M. Ahmed. “Vacuum-ultraviolet (VUV) photoionization of small methanol and methanol-water clusters” J. Phys Chem. A 112, (2008) 9555

55. S. Chakraborty, M. Ahmed, T. L. Jackson and M. H. Thiemens. “Experimental Test of Isotopic Self-Shielding in VUV photodissociation of CO” Science 321, (2008) 1328

2007

54. L. Belau, K. R. Wilson, S. R. Leone, and M. Ahmed.  “Vacuum Ultraviolet (VUV) photoionization of small water clusters.” J. Phys. Chem. A 111 (2007) 10075

53. L. Belau, S.E. Wheeler, B.W. Ticknor, M. Ahmed, S.R. Leone, W.D. Allen, H.F. Schaefer III, M.A. Duncan. “Ionization Thresholds of Small Carbon Clusters: Tunable VUV Experiments and Theory.” J. Am. Chem. Soc. 129 (2007) 10229

52. K. R. Wilson, S. Zou,  J. Shu, E. Rühl, S. R. Leone, G. C. Schatz and M. Ahmed.  “Size-Dependent Angular Distributions of Low Energy Photoelectrons emitted from NaCl Nanoparticles.”  Nano Lett. 7 (2007) 2014

51. L. Belau, K. R. Wilson, S. R. Leone, and M. Ahmed.  “Vacuum-Ultraviolet photoionization studies of the micro-hydration of DNA bases (Guanine, Cytosine, Adenine and Thymine)” J. Phys. Chem. A 111 (2007) 7562

50. R. I. Kaiser, L. Belau, S. R. Leone, M. Ahmed, Y. Wang, B. J. Braams, and J. M. Bowman. “A Combined Experimental and Computational Study on the Ionization Energies of the Cyclic and Linear C3H Isomer” ChemPhysChem 8 (2007) 1236

2006

49. M. Ahmed. “Photoionization of neutrals desorbed from surfaces”. Encyclopedia of Mass Spectrometry, Volume 6, Elsiever (2007)

48. G. Meloni, P. Zou, S. J. Klippenstein, M. Ahmed, S. R. Leone, C. A. Taatjes, and D. L. Osborn. “Energy-resolved photoionization of alkyl peroxy radicals and the stability of their cations” J. Am. Chem. Soc. 128 (2006) 13567

47. E. F. Gloaguen, E. R. Mysak, S. R. Leone, M. Ahmed and K. R. Wilson. “Investigating the chemical composition of mixed organic-inorganic particles by "soft" VUV photoionization: the reaction of ozone with anthracene on sodium chloride particles.”  Int. J. Mass. Spectrom. 258 (2006) 74

46. J. Plenge, C. Nicolas, A. Caster, M. Ahmed, and S. R. Leone. “Two-color vacuum ultraviolet/visible photoelectron imaging dynamics of Br2.”  J. Chem. Phys. 125 (2006) 133315

45. J. Shu, K. R. Wilson, M. Ahmed, and S. R. Leone. “Coupling a versatile aerosol apparatus to a synchrotron: vacuum ultraviolet light scattering, photoelectron imaging, and chemistry of fine particles.” Rev. Sci. Inst. 77 (2006) 043106

44. K. R. Wilson, D. S. Peterka, M. Jimenez-Cruz, S.R. Leone, and M. Ahmed. “VUV photoelectron imaging of biological nanoparticles: Ionization energy determination of nanophase glycine and phenylalanine-glycine-glycine.” Phys. Chem. Chem. Phys.  8 (2006) 1884

43. K. R. Wilson, L. Belau, M. Jimenez-Cruz, C. Nicolas, S. R. Leone, and M. Ahmed. “Direct determination of the ionization energy of histidine with VUV synchrotron radiation”. Int. J. Mass Spectrom. 249-250, (2006) 511

42. T. Zhang, X. N. Tang, C.Y. Ng, C. Nicolas, D. S. Peterka, M. Ahmed, M. L. Morton, B. Ruscic, R. Yang, L. X. Wei, C. Q. Huang, B. Yang, J. Wang, X. B. Shan, L. S. Sheng, and F. Qi. “Direct identification of propargyl radical in combustion flames by VUV photoionization mass spectrometry”. J. Chem. Phys. 124 (2006) 074302

41. C. Nicolas, J. Shu, D. S. Peterka, M. Hochlaf, L. Poisson, S. R. Leone, and M. Ahmed. “Vacuum ultraviolet photoionization of C3”. J.  Am. Chem. Soc. 128 (2006) 220

40. J. Shu, K. R. Wilson, M. Ahmed, S. R. Leone, C. Graf, and E. Ruhl. “Elastic light scattering from free nanoparticles in the vacuum- ultraviolet regime.” J. Chem. Phys. 124 (2006) 34707

39. K. R. Wilson, M. Jimenez-Cruz, C. Nicolas, L. Belau, S. R. Leone, and M. Ahmed. “Thermal Vaporization of Biological Nanoparticles: Fragment-Free VUV Photoionization Mass Spectra of Tryptophan, Phenylalanine-Glycine-Glycine and ß-carotene,” J. Phys. Chem A. 110 (2006) 2106

2003-2005

38. T.A. Cool, A. Mcllroy, F. Qi, P.R. Westmoreland, L. Poisson, D.S. Peterka, and M. Ahmed. “A photoionization mass spectrometer for studies of flame chemistry with a synchrotron light source” Rev. Sci. Inst. 76 (2005) 94102

37. R. B. Metz, C. Nicolas, M. Ahmed, and S. R. Leone. “Direct determination of ionization energies of FeO and CuO with vacuum ultraviolet radiation.” J. Chem. Phys.  123 (2005) 114313

 36. E. R. Mysak, K. R. Wilson, M Jimenez-Cruz, M. Ahmed, and T. Baer. “Synchrotron radiation based aerosol time-of-flight mass  spectrometry for organic constituents”. Anal. Chem. 77 (2005) 5953

35. J. Shu, K. R. Wilson, A. N. Arrowsmith, M. Ahmed and S. R. Leone. “Light scattering of ultrafine silica particles by VUV  synchrotron radiation” Nano Lett. 5 (2005) 109

34. D. S. Peterka and M. Ahmed. “Atoms to Aerosols- the chemical dynamics beamline”. Synchrotron Radiation News. 18 (2005) 35

33. F. Davis, J. Shu, D.S. Peterka, and M. Ahmed. “A crossed beams study of the reaction: 1CH2 + C2H2 -> C3H3 + H” J. Chem. Phys. 121     (2004) 2546

32. J. Shu, D.S. Peterka, S. R. Leone, and M. Ahmed. “Tunable synchrotron vacuum ultraviolet ionization, time-of-flight investigation  of the photodissociation of trans-crotonaldehyde at 193 nm” J. Phys. Chem, A 108 (2004) 7895

31. W. Li, L. Poisson, D.S. Peterka, M. Ahmed, R.R. Lucchese,  A.G. Suits. “Dissociative photoionization dynamics in ethane studied by  velocity map imaging” Chem. Phys. Lett. 374 (2003) 334

30. D.S.Peterka, A. Lindinger, L. Poisson, M. Ahmed, and D.N. Neumark. “Photoelectron imaging of helium droplets” Phys. Rev. Lett.  91 (2003) 43401

29. T.A. Cool, T.A. Mostefaoui, F. Qi, A. Mcllroy, P.R. Westmoreland, M.E. Law, L. Poisson,  D.S. Peterka, and M. Ahmed.  “Selective  detection of isomers with photoionization mass spectrometry for studies of hydrocarbon flame chemistry” J. Chem. Phys. 119, (2003) 8356

28. X. Qian, A. H.Kung, T. Zhang, C.Y. Ng, and M. Ahmed. “Two-color photoionization spectroscopy using vacuum ultraviolet   synchrotron radiation and infrared optical parametric oscillator laser.” Rev. Sci. Instrum. 74 (2003) 2784

Photodissociation, Photoionization, and Crossed Molecular Beams (1997-2002)

27. F. Qi, L. Sheng, M. Ahmed, D. S. Peterka and T. Baer. “Exclusive production of excited-state sulfur (1D) atoms from 193 nm photolysis of thietane”, Chem. Phys.Lett.  357 (2002) 204

26.  E.R. Wouters, M. Ahmed, D.S. Peterka, A.S. Bracker, A.G. Suits and O.S. Vasyutinskii.”Imaging the atomic orientation and alignment in photodissociation.” Imaging in Chemical Dynamics, A.G.  Suits and R. E. Continetti, eds., ACS Symposium Series 770,   American Chemical Society, Washington DC, pp 238

25.  M. Ahmed, D.S. Peterka, and A.G. Suits. “New directions in reaction dynamics using velocity map imaging.” Imaging in Chemical Dynamics, A.G.  Suits and R.E. Continetti, eds., ACS Symposium Series 770,   American Chemical Society, Washington DC, pp 167

24. M. Ahmed, D.S. Peterka, and A.G. Suits. “Photodissociation of NO2 near 225 nm by Velocity Map Imaging.”Atomic and Molecular Beams – The State of the Art 2000. ed. R Campargue, Springer –Verlag Berlin  Heidelberg  2001, pp 343

23. M Ahmed, D S. Peterka, P Regan, X Liu and A. G. Suits. “Ion Pair Imaging Spectroscopy: CH3Cl ® CH3+ + Cl-“ Chem. Phys. Lett. 339 (2001) 203

22. M. Ahmed, D. S. Peterka, and A. G. Suits. “Crossed Molecular Beam Reactive Scattering in Conjunction With Velocity Map Imaging and Single Photon Ionization” Lambda Highlights, No 56, (2000)

21. M. Ahmed, D.S. Peterka, and A.G. Suits. “Imaging H abstraction dynamics in crossed molecular beams: Cl + ROH reactions” Phys. Chem. Chem. Phys. 2 (2000) 861

20. M. Ahmed, D.S. Peterka, and A.G. Suits. “H abstraction dynamics by crossed-beam velocity map imaging: Cl + CH3OH ® CH2OH + HCl.” Chem. Phys. Lett. 317 (2000) 264

19. M. Ahmed, D.S. Peterka, and A.G. Suits. “The photodissociation of the vinyl radical (C2H3) at 243 nm studied by velocity map imaging.” J. Chem. Phys. 110 (1999) 4248

18. M. Ahmed, D.S. Peterka and A.G. Suits. “Velocity map imaging of the O(1D) + D2 ® OD + D reaction.” Chem. Phys. Lett. 301 (1999) 372

17. D.S. Peterka, M. Ahmed, C.Y.Ng and A.G. Suits. “Dissociative photoionization dynamics of SF6 by ion imaging with synchrotron undulator radiation.” Chem. Phys. Lett. 312 (1999) 108

16. M. Ahmed, E.W. Wouters, D.S. Peterka, O.S. Vasyutinski, and A.G. Suits. “Atomic orbital alignment and coherence in N2O photodissociation at 193.3 nm.” Faraday Discuss. 113 (1999) 425

15. D.S. Peterka, M. Ahmed, A.G. Suits, K.J. Wilson, A. Korkin, M. Noojen, and R.J. Bartlett. “Unravelling the mysteries of metastable O4*. (vol 110, pg 6095, 1999)” J. Chem. Phys. 111 (1999) 5279

14. D.S. Peterka, M. Ahmed, A.G. Suits, K.J. Wilson, A. Korkin, M. Noojen, and R.J. Bartlett. “Unravelling the mysteries of metastable O4*.” J. Chem. Phys. 110 (1999) 6095

13. M. Ahmed, D.S. Peterka, A.S. Bracker, O.S. Vasyutinski, and A.G. Suits. “Coherence in polyatomic photodissociation:Aligned O(3P) from photodissociation of NO2 at 212.8 nm.” J. Chem. Phys. 110 (1999) 4115

12. W.M. Jackson, R.J. Price, D.D. Xu, J.D. Wrobel, M. Ahmed, D.S. Peterka and A.G. Suits. “Velocity map imaging studies of the Lyman -a  photodissociation mechanism for H atom production from hydrocarbons.”  J. Chem. Phys. 109 (1998) 4703

11. H.M. Bevsek, M. Ahmed, D.S. Peterka, F.C. Sailes and A.G. Suits.  “Direct detection and spectroscopy of O4*.” Faraday  Discuss. 108 (1997) 131

10. M. Ahmed, D. Blunt, D. Chen and A.G. Suits. “UV photodissociation of oxalyl chloride yields four fragments from one photon absorption.”  J. Chem. Phys. 106 (1997) 7617

Graduate and Postdoctoral work (1989-1997)

9. M. Ahmed, C.J. Apps, M.J. Bramwell, J.L. Cooper, C. Hughes, K. Reinhardt, J.C. Whitehead,  F. Winterbottom and A. Hopkirk.  “Fluorescence excitation spectroscopy of some haloethenes, CF2=CXY (XYºFCl, Cl2, FH), excited in the vacuum ultraviolet (70-180 nm).” Chem. Phys. (1997) 219, 333

8. M. Ahmed, C.J. Apps, R. Buensel, C. Hughes, N.E. Watt, I.H. Hillier and J.C. Whitehead. “Adsorption of NxOy - based molecules on large water clusters: An experimental and theoretical study.” J. Phys. Chem. A (1997) 101, 1254

7. M. Ahmed, C.J. Apps, C. Hughes, N.E. Watt and J.C. Whitehead.  “Adsorption of organic molecules on large water clusters.”  J. Phys. Chem. A (1997) 101, 1250

6. M. Ahmed, C.J. Apps, C. Hughes, and J.C. Whitehead. “The adsorption of methanol on large water clusters.”  Chem. Phys. Lett. (1995) 240, 216

5. M. Ahmed, P. Potzinger and H.Gg. Wagner. “Photolysis of tetramethylsilane near the absorption onset: Mechanism and Photophysics.” J. Photochem. Photobiol. A-Chem. (1995) 86, 33

4. M. Ahmed, C.J. Apps, C. Hughes, and J.C. Whitehead. “Vacuum ultraviolet excitation of large water clusters.”  J. Phys. Chem. (1994) 98, 12530

3. M. Ahmed, I.M.T. Davidson, G.H. Morgan and T. Simpson.  “Mechanism of pyrolysis of 2,2-Diethylhexamethyltrisilane.” Organometallics. (1991) 10, 3772

2. M. Ahmed and A.B. Callear. “Mercury photosensitised excitation of SO2 - Formation of triplet states in termolecular collisions.” Chem. Phys. Lett. (1989) 157, 556

1. M. Ahmed and A.B. Callear.  “Rate coefficients for reaction of C2H2 (a3B2).” Chem. Phys. Lett. (1989) 156, 35