The APAPES initiative establishes in Greece the discipline of Atomic Physics with Accelerators, a field with important contributions to fusion, hot plasmas, astrophysics, accelerator technology and basic atomic physics of ion-atom collision dynamics, structure and technology. This is being accomplished by combining the existing interdisciplinary atomic collisions expertise from three Greek universities, the strong support of distinguished foreign researchers and the high technical ion-beam know-how of the Demokritos Tandem accelerator group into a cohesive initiative. The new experimental setup includes a single stage hemispherical spectrometer with injection lens and 2-dimensional PSD combined with a doubly-differentially pumped gas target. It has been used in previous work at Kansas State Univ., but moved to the Athens Tandem since 2010. This high efficiency, high-resolution ZAPS system is ideally suited for use in the electron spectroscopy of weak ion beams.

For detailed information visit the APAPES webpage 

Current Members of the Scientific Team

• Manolis Benis  - Associate Professor, Department of Physics, University of Ioannina 

• Theo Zouros  - Professor (Retired),  Department of Physics, University of Crete

• Angelos Laoutaris - PhD candidate,  Department of Physics, University of Crete

• Stefanos Nanos - PhD candidate,  Department of Physics, University of Ioannina

• Andreas Biniskos - Master student,  Department of Physics, University of Ioannina

Former Members

• Ioannis Madesis - PhD candidate,  Department of Physics, University of Crete (2014-2021)

• Anastasios Dimitriou - Post-Doc,  (2016-2018)

Current Research Topics

• Single electron capture 

• Double electron capture 

• Transfer and Excitation

• He-like hollow states

• Cusp electrons

Publications

1. Atomic Physics with Accelerators: Projectile Electron Spectroscopy (APAPES), I. Madesis, A. Dimitriou, A. Lagoyannis, M. Axiotis, T. Mertzimekis, M. Andrianis, S. Harissopulos, E.P. Benis, B. Sulik, I. Valastyán, T.J.M. Zouros, Journal of  Physics: Conference Series 583, 012014 (2015). https://doi.org/10.1088/1742-6596/583/1/012014 

2. Determination of the solid angle and response function of a hemispherical spectrograph with injection lens for Auger electrons emitted from long lived projectile states, S. Doukas, I. Madesis, A. Dimitriou, A. Laoutaris, T. J. M. Zouros and E. P. Benis, Rev. Sci. Instrum. 86, 043111 (2015).  https://doi.org/10.1063/1.4917274 

3. Evaluation of the effective solid angle of a hemispherical deflector analyser with injection lens for metastable Auger projectile states, E. P. Benis, S. Doukas, T.J.M. Zouros, P. Indelicato, F. Parente, C. Martins, J.P. Santos, J.P. Marques, Nucl. Instum. Methods Phys. Res. B 365, 457 (2015). https://doi.org/10.1016/j.nimb.2015.07.006 

4. Evidence for the non-statistical population of the 1s2s2p 4P metastable state by selective electron capture in 4 MeV collisions of B3+ (1s2s 3S) with H2 targets, E. P. Benis, S. Doukas, T.J.M. Zouros, Nucl. Instum. Methods Phys. Res. B 369, 83 (2016). https://doi.org/10.1016/j.nimb.2015.10.010 

5. Determination of the 1s2l2l' state production ratios 4Po/2P, 2D/2P and 2P+/2P- from fast (1s2, 1s2s 3S) mixed-state He-like ion beams in collisions with H2 targets, E. P. Benis and T.J.M. Zouros, J. Phys. B 49, 235502 (2016). https://doi.org/10.1088/0953-4075/49/23/235202 

6. High resolution Auger projectile electron spectroscopy of  Li-like ions produced by electron capture in collision of He-like ions with gaseous targets, A. Dimitriou, A. Laoutaris, I. Madesis, S. Doukas, E.P. Benis, B. Sulik, O. Sise, A. Lagoyannis, M. Axiotis and T.J.M. Zouros. J. of Atom. Mol. Cond. and Nano Physics 3, 125 (2016). 

7. Radiative transition rates of 1s2s(3S)3p levels for Li-like ions with 5 ≤ Z ≤ 10, J. P. Santos, F. Parente, M. C. Martins, P. Indelicato, E. P. Benis, T. J. M. Zouros, J. P. Marques, Nucl. Instum. Methods Phys. Res. B 408, 100 (2017). https://doi.org/10.1016/j.nimb.2017.04.015 

8. Experimental determination of the effective solid angle of long-lived projectile states in zero-degree Auger projectile spectroscopy, E. P. Benis, I. Madesis, A. Laoutaris, S. Nanos and T. J. M. Zouros, J. Electr. Spectr. Rel. Phenom. 222, 31 (2018). https://doi.org/10.1016/j.elspec.2017.10.001 

9. Mixed-state ionic beams. An effective tool for collision dynamics investigations, E. P. Benis, I. Madesis, A. Laoutaris, S. Nanos and T.J.M. Zouros, Atoms  6(4), 66 (2018). https://doi.org/10.3390/atoms6040066 

10. Projectile electron spectroscopy and new answers to old questions. Latest results at the new atomic physics beamline in Demokritos, Athens, I. Madesis, A. Laoutaris, T.J.M. Zouros, S. Nanos, E.P. Benis, in State-of-the-Art Reviews on Energetic Ion-Atom and Ion-Molecule Collisions, Interdisciplinary Research on Particle Collisions and Quantitative Spectroscopy, Vol. 2, edited by D. Belkic, I. Bray, and A. Kadyrov, World Scientic (2019).  https://doi.org/10.1142/11588 

11. Method for determining the lifetimes of the long-lived 1s2s2p 4PJ state J-levels, S. Nanos and E. P. Benis, AIP Conf. Proc 2075, 200001 (2019). https://doi.org/10.1063/1.5091426 

12. Population of the 1s2s(3S)nl 2L states in collisions of mixed-state (1s2 1S, 1s2s 3S) B2+ and C3+ ion beams with He/H2 targets, E. P. Benis, I. Madesis, A. Laoutaris, S.K. Nikolaou, A. Dubois, T.W. Gorczyca and T.J.M. Zouros, X-Ray Spectrometry 49, 54-59 (2020). https://doi.org/10.1002/xrs.3050 

13. Pauli shielding and break-down of spin statistics in multi-electron, multi-open-shell dynamical atomic systems, I. Madesis, A. Laoutaris, J.W. Gao, E.P. Benis, A. Dubois, T.J.M. Zouros, Phys. Rev. Lett. 124, 113401 (2020) https://doi.org/10.1103/PhysRevLett.124.113401 

14. Radiative cascade repopulation of 1s2s2p 4P states formed by single electron capture in 2-18 MeV collisions of C4+(1s2s 3S) with He , T.J.M. Zouros, S. Nikolaou, I. Madesis, A. Laoutaris, S. Nanos, A. Dubois and E.P. Benis, Atoms 8(3), 61 (2020). doi.org/10.3390/atoms8030061 

15. Subshell contributions to electron capture to the continuum in MeV/u collisions of deuterons with multielectron targets, S. Nanos, M.A. Quinto, I. Madesis, A. Laoutaris, T. J. M. Zouros, R.D. Rivarola, J.M. Monti, and E.P. Benis, Phys. Rev. A 105, 022806 (2022). https://doi.org/10.1103/PhysRevA.105.022806

16. Binary encounter electrons in fast dressed-ion–atom collisions: distorted wave theories and experiment, N. J. Esponda, S. Nanos, M.A. Quinto, T. J. M. Zouros, R.D. Rivarola, E.P. Benis and J.M. Monti, ATOMS 11, 17 (2023) https://doi.org/10.3390/atoms11020017