Publications

 2015

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

119. D. S. N. Parker, R. I. Kaiser, O. Kostko, T. P. Troy,  M. Ahmed, A. M. Mebel & A. G. G. M. Tielens, "Gas Phase Synthesis of (Iso)Quinoline and Its Role in the Formation of Nucleobases in the Interstellar Medium", Astrophys. J. (accepted)

118. T. K. Ormond, A. M. Scheer, M. R. Nimlos, D. J. Robichaud, T. P. Troy, M. Ahmed, J. W. Daily, T. L. Nguyen, J. F. Stanton, G. B. Ellison,  "Pyrolysis of Cyclopentadienone: Mechanistic Insights from a direct measurement of product branching ratios." J. Phys. Chem. A (just accepted)

117. P.T. Lynch, T. P. Troy, M. Ahmed, & R. S. Tranter,  "Probing Combustion Chemistry in a Miniature Shock Tube with Synchrotron VUV Photo Ionization Mass Spectrometry". Anal. Chem. (Just Accepted)

116. G. Buckingham, T. Ormond, J. Porterfield, P. Hemberger, O. Kostko, M. Ahmed, D. J. Robichaud, M. Nimlos, J. Daily, and G. B. Ellison, "The Thermal Decomposition of the Benzyl Radical in a Heated Micro-Reactor: I. Experimental Findings", J. Chem. Phys. 142, 044307 (2015)

2014

115. D. S. N. Parker, R. I. Kaiser, T. P. Troy, O. Kostko, M. Ahmed & A. M. Mebel, "Towards the Oxidation of the Phenyl Radical and Prevention of PAH formation in Combustion Systems." J. Phys. Chem. A (in press)

114. S. Chakraborty, B. H. Muskatel, T. L. Jackson, M. Ahmed, R. D. Levine, & M. H. Thiemens, "Massive isotopic effect in vacuum UV photodissociation of N2 and implications for meteorite data"PNAS 2014, 41, 14704–14709

113. S. Y. Liu, M. D. Shawkey, D. Parkinson, T. P. Troy & M. Ahmed, "Elucidation of the chemical composition of avian melanin"  RSC Advances 2014,4, 40396

112. D. S. N. Parker, R. I. Kaiser, T. P. Troy, & M. Ahmed, "Hydrogen Abstraction-Acetylene Addition Revealed," Angew. Chem. 2014, 53, 7740  story on this

111. S. Neppl,   A. Shavorskiy,   I. Zegkinoglou,   M.Fraund,   D. S. Slaughter,   T. P. Troy,   M. P Ziemkiewicz,   M. Ahmed,   S. Gul,   B. Rude,   J. Z Zhang,   A. S Termsin,   P-A Glans,   Y-S Liu,   C. H. Wu,   J. Guo,   M.Salmeron,   H. Bluhm and   O. Gessner, Capturing Interfacial photo-electrochemical dynamics with picosecond time-resolved X-ray photoelectron spectroscopy. Faraday Discussions 2014,171, 219-241 

110.  J. Randazzo, P. Croteau, O. Kostko, M.Ahmed, and K. Boering,  "Isotope effects and spectroscopic assignments in the non-dissociative photoionization spectrum of N2"       J. Chem. Phys., (2014) 140, 194303       

109. H-W. Chang, C-C. Hsu, M. Ahmed, S.Y. Liu, Y. Fang, J. Soeg, G. Oehrlein, D. Graves, "Plasma Flux Dependent LIpid A Deactivation", J. Phys. D: Appl. Phys., (2014) 47 224015

108. M. Perera, K. M. Roenitz, R. B. Metz, O. Kostko, and M. Ahmed, "VUV photoionization measurements and electronic structure calculations of the ionization energies of gas-phase tantalum oxides TaOx (x=3-6)." J. Spectroscopy  and Dynamics. (2014), 4 1

2013

107. C. Bhardwaj, Y. Cui, T. Hofstetter, S. Y. Liu, H. C. Bernstein, R. Carlson, M. Ahmed, and L. Hanley. "Differentiation of Microbial Species  and Strains in Coculture Biofilms by Multivariate Analysis of Laser Desorption Postionization Mass Spectra." Analyst (2013),138, 6844

106.   K. Urness, Q. Guan, A. Golan, J. Daily, M. Nimlos, J. Stanton, M. Ahmed, and G. B. Ellison, "Pyrolysis of furan in a microreactor" J. Chem. Phys. 139, 124305 (2013) 

105. F. Bell, Q.N. Ruan, A. Golan, P. R. Horn, M. Ahmed, S. R. Leone, and M. Head-Gordon. "Dissociative Photoionization of Glycerol and its   Dimer Occurs predominantly via a ternary hydrogen bonded ion-molecule complex," J. Am. Chem.     Soc. 135, 14229 (2013)

104. K. Khistyaev, A. Golan, K.B. Bravaya, N. Orms, A. I. Krylov, and M. Ahmed. "Proton Transfer in Nucleobases is Mediated by Water", J. Phys. Chem. A 117, 6789 (2013)

103. S-Y. Liu, M. Kleber, L. K. Takahashi, P. Nico, M. Keiluweit, and M. Ahmed. "Synchrotron based mass spectrometry to investigate the molecular properties of mineral-organic associations,”Anal. Chem. 85, 6100 (2013)

102. M. Perera, R. B. Metz, O. Kostko, and M. Ahmed, "Vacuum Ultraviolet Photoionization Studies of PtCH2 and H-Pt-CH3: A Potential Energy Surface for the Pt + CH4 reaction." Angew. Chem. Int. Ed. 125, 922 (2013)

101. S. Chakraborty, T. Jackson, M. Ahmed, and M. H. Thiemens, "Sulfur Isotopic Fractionation in Vacuum Ultraviolet Photodissociation of Hydrogen Sulfide: Potential Relevance to Meteorite Analysis," PNAS (2013) 110, 17650
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100. A. Golan, M. Ahmed, A. Mebel, and R.I. Kaiser, “A VUV Photoionization Study on the Formation of Primary and Secondary Products in the Reaction of the Phenyl Radical with 1,3-Butadiene under Combustion Relevant Conditions.”  Phys. Chem. Chem. Phys. 15, 341 (2013)

2012

99. R.I. Kaiser,  S. Krishtal, A. Mebel, O. Kostko, and M. Ahmed, "An Experimental and Theoretical Study on the Ionization Energies of SiC2Hx (x = 0, 1, 2) Isomers in the Interstellar Medium, Astrophys. J. 761, 178 (2012)

98. A. Golan and M. Ahmed, "Molecular beam mass spectrometry with tunable vacuum ultraviolet (VUV) synchrotron radiation", J. Vis. Exp. 68, e50164, (2012).

97. A.G. Vasiliou, K. M. Piech, B. Reed, X. Zhang, M. R. Nimlos, M. Ahmed, A. Golan, O. Kostko, D. L. Osborn, J. W. Daily, J. F. Stanton, and G. B. Ellison, “Thermal Decomposition of CH3CHO Studied by Matrix Infrared Spectroscopy and Photoionization Mass Spectroscopy ”.  J. Chem. Phys. 137, 164308 (2012)

96. S. Chakraborty, R. Davis, M. Ahmed, T. L. Jackson, and M. H. Thiemens, “Oxygen isotope fractionation in vacuum ultraviolet photodissociation of carbon monoxide: Wavelength, pressure and temperature dependency” J. Chem. Phys. (2012),  137, 024309

95. K.S. Kalogerakis, C. Romanescu, M. Ahmed, K. R. Wilson, T. G. Slanger, "CO prompt emission as a CO2 marker in comets and planetary atmospheres". Icarus (2012), 220, 205

94. F. Zhang, R.I. Kaiser, A. Golan, M. Ahmed and N. Hansen, “A VUV Photoionization Study of the Combustion-Relevant Reaction of the Phenyl Radical (C6H5) with Propylene (C3H6) in a High Temperature Chemical Reactor “ J. Phys. Chem. A (2012)116, 3541

93.  A. Golan, K. B. Bravaya, R. Kudirka, O. Kostko, S. R. Leone,  A. I. Krylov, and M. Ahmed, “Ionization of stacked dimethyluracil dimers leads to facile proton transfer in the absence of H-bonds”.  Nature Chem. (2012), 4, 323
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92.  A. Golan and M. Ahmed, “Ionization of water clusters mediated by exciton energy transfer from argon clusters”, J. Phys. Chem. Lett. (2012) 3, 458

91.  M. J. Berg, K. R. Wilson, C. Sorensen, A. Chakrabarti, and M. Ahmed, “Discrete Dipole Approximation Model for Low-Energy Photoelectron Emission from NaCl Nanoparticles” J. Quant. Spectrosc. Radiat. Transfer (2012) 113,259

90. D. Ghosh, A. Golan, L. Takahashi, A.I. Krylov and M. Ahmed “An experimental and theoretical determination of the ionization energy of deoxyribose” , J. Phys. Chem. Lett. (2012) 3, 97

2011

89.  O. Kostko, L. K. Takahashi, and M. Ahmed. “Desorption Dynamics, Internal Energies and Imaging of Molecules from Surfaces with Laser Desorption and Vacuum Ultraviolet (VUV) Photoionization” , Chem. Asian. J. (2011)6, 3066

88.  F. Zhang, R.I. Kaiser, V.V. Kislov, A.M. Mebel, A. Golan and M. Ahmed, “A VUV Photoionization Study of the Formation of the Indene Molecule and Its Isomers” J.Phys. Chem. Lett. (2011) 2, 1031

87.  A.G. Vasiliou, K. M. Piech, X. Zhang, M. R. Nimlos, M. Ahmed, A. Golan, O. Kostko, D. L. Osborn, J. W. Daily, J. F. Stanton, and G. B. Ellison, “The Products of the Thermal Decomposition of CH3CHO”. J. Chem. Phys. (2011) 135, 014306

86.  M. T. Blaze, L.K. Takahashi, J. Zhou, M. Ahmed, F. D. Pleticha, and L. Hanley, “Brominated Tyrosine and Polyelectrolyte Multilayer Analysis by Laser Desorption VUV Postionization and Secondary Ion Mass Spectrometry”.  Anal.  Chem.(2011) 83, 4962

85. C.L. Liu, J. D. Smith, D. L. Che, M. Ahmed, S. R. Leone, and K. R. Wilson, “The Direct Observation of Secondary Chemistry in the Heterogeneous Reaction of Chlorine Atoms with Submicron Squalane Droplets” Phys. Chem. Chem. Phys. (2011) 13, 8993

84.  K. Khistyev, K. B. Bravaya, E. Kamarchik, O. Kostko, M. Ahmed, and A. I. Krylov, “The effect of microhydration on ionization energies of thymine” Faraday Disc. (2011) 150, 313

83. G. L. Gasper, L.K. Takahashi, J. Zhou, M. Ahmed, J. F. Moore, and L. Hanley, “Comparing Vacuum and Extreme Ultraviolet Radiation for Postionization of Laser Desorbed Neutrals from Bacterial Biofilms and Organic Fullerene” Nuclear Instruments and Methods in Physics Research Section A (2011) 649,222

82.  L.K. Takahashi, J. Zhou, O. Kostko, A. Golan, S. R. Leone and M. Ahmed, “VUV Photoionization and Mass Spectrometric Characterization of the Lignin Monomers Coniferyl and Sinapyl Alcohol” J. Phys. Chem. A (2011) 115, 3279

81.  P. Croteau, J. B. Randazzo, O. Kostko, M. Ahmed, M.C.  Liang, Y.  L. Yung and K. A. Boering, “Experimental determination of isotope effects in the non-dissociative photoionization of molecular nitrogen and implications for Titan's atmosphere” Astrophys. J. Lett. (2011) 728, L32

2010

80. K. B. Bravaya, O. Kostko, S. Dolgikh, A Landau, M. Ahmed, and A. I. Krylov “Electronic structure and spectroscopy of nucleic acid bases: Ionization energies, ionization-induced structural changes, and photoelectron spectra” J. Phys. Chem. A (2010) 114, 12305

79. M. Sleiman, H. Destaillats, J.D. Smith, Chen-Lin Liu, M. Ahmed, K. R. Wilson and L. A. Gundel, “Secondary organic aerosol formation from ozone-initiated reactions with nicotine and secondhand smoke” Atmos. Environ. (2010) 44, 4191

78. R. I. Kaiser, P. Maksyutenko, C. Ennis, F. Zhang, X. Gu, A. Mebel, O. Kostko, M. Ahmed,Untangling the Chemical Evolution of Titan’s Atmosphere and Surface: From Homogeneous to Heterogeneous Chemistry” Faraday Disc. (2010) 147, 429

77. K. R. Wilson, H. Bluhm, M. Ahmed, Aerosol Photoemission, in Fundamentals and Applications in Aerosol Spectroscopy, edited by J.P. Reid and R. Signorell, Taylor and Francis, (2010) pp 367-417

76.  G. L. Gasper, L. K. Takahashi, J. Zhou, J. Moore, M. Ahmed, L. Hanley. “Laser Desorption Postionization Mass Spectrometry of Antibiotic-Treated Bacterial Biofilms using Tunable Vacuum Ultraviolet Radiation” Anal. Chem. (2010) 82, 7472

75. R. I. Kaiser, B. J. Sun, H. M. Lin, A. H. H. Chang, A. Mebel, O. Kostko and M. Ahmed “An Experimental and Theoretical Study on the Ionization Energies of Polyynes (H-(CºC)n-H; n = 1 - 9)” Astrophys. J. (2010) 719 1884.

74. O. Kostko, J. Zhou, A. Chang, B. J. Sun, J. S. Lie, A. H. H. Chang, R. I. Kaiser and M. Ahmed Determination of ionization energies of CnN (n=3-12) clusters: Vacuum-ultraviolet (VUV) photoionization experiments and theoretical calculations” Astrophys. J. (2010) 717, 674

73. S. R. Leone, M. Ahmed and K. R. Wilson, “Chemical Dynamics, Molecular Energetics, and Kinetics at the Synchrotron” Phys. Chem. Chem. Phys., (2010) 12, 6564

72. E. Kamarchik, J. M. Bowman, O. Kostko, M. Ahmed, and A. I. Krylov, “Spectroscopic signatures of proton transfer dynamics in the water dimer cation”.  J. Chem. Phys.  (2010) 132, 194311

71.  J. Zhou, L. Takahashi, K. R. Wilson, S. R. Leone and M. Ahmed, “Determination of Internal Energies of Ion Desorbed Neutral Organic Molecules with Tunable Vacuum Ultraviolet Photoionization” Anal. Chem. (2010) 82, 3905

70. O. Kostko, K. Bravaya, A. I. Krylov, and M. Ahmed, “Ionization of cytosine monomer and dimer studied by VUV photoionization and electronic structure calculations.” Phys. Chem. Chem. Phys., (2010), 12, 2860.

69. O. Kostko, S. R. Leone, M. A.  Duncan and M. Ahmed, “Determination of ionization energies of small silicon  clusters with vacuum‐ultraviolet (VUV) photoionization.”  J.Phys. Chem. A (2010), 114, 3176

68. K. Bravaya, O. Kostko, M. Ahmed, and A. I. Krylov, “The effect of pi-stacking, h-bonding, and electrostatic interactions on the ionization energies of nucleic acid bases: adenine-adenine, thymine-thymine and adenine-thymine dimers” Phys. Chem. Chem. Phys. 12, (2010) 2261

67.  D. Strasser, F. Goulay, L. Belau, O. Kostko, C. Koh, S. D. Chambreau, G. L.Vaghjiani,  Z.H. Loh, M. Ahmed and S. R. Leone, “Tunable wavelength soft photoionization of ionic liquid vapors” J. Phys. Chem. A 114, (2010) 879

66. R. I. Kaiser, A. Mebel, O. Kostko and M. Ahmed, “On the ionization energies of C4H3 Isomers” Chem. Phys. Lett. 485, (2010) 281

2009

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 113, (2009) 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.  11 (2009) 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 324, (2009) 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 113, (2009) 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. 9, (2009) 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 113, (2009) 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 SiO2J. Phys. Chem. A 113, (2009) 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. 219 (1997) 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 101 (1997) 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 101 (1997) 1250

6. M. Ahmed, C.J. Apps, C. Hughes, and J.C. Whitehead. “The adsorption of methanol on large water clusters.”  Chem. Phys. Lett. 240 (1995) 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. 86 (1995) 33

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

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

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

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

 

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