Charged particle impact ionization cross sections of atoms, ions and molecules in distorted wave formalismONLINE ONLY

Ionization of targets such as atoms, ions, and molecules by charged projectiles such as electrons / positrons has been studied for a long time and has various applications; few may be listed as diagnostics of fusion plasmas, modeling of physics and chemistry related to atmosphere, understanding the effect of ionizing radiation on biological tissues etc.  Detailed information about this kind of collision processes is obtained from the triple differential cross sections (TDCS) obtained through the coincidence study, which has been of interest since the pioneering work of Ehrhardt group [1]. Coincidence study of TDCS has been of particular interest since it provides full information about the collision dynamics and momentum vectors of all the free particles involved in the ionization.

Good amount of ionization cross section studies has been reported for atomic targets [2].  From last decade molecular targets have also been studied for the ionization processes [2, 3] as well as electron momentum spectroscopy [4].  We report the results of our recent work on the calculation of electron impact ionization cross sections based on distorted wave Born approximation formalism (DWBA) for atomic (Ar, Be, W) [5, 6], ionic (charged states of Be and W) [7] and molecular (N2, H2O) [8] targets.  We will review briefly the status of charged particle ionization processes from targets with introductory idea about the distorted wave theoretical formalism involved. Results for the electron / positron impact ionization of atomic / ionic / molecular targets will be discussed.

References:
[1] H. Ehrhardt, K. H. Hesselbacher, K. Jung, and K. Willmann, J. Phys. B 5, 1559 (1972).
[2] D. H. Madison and O. Al-Hagan, J. At. Mol. Opt. Phys. 2010, 367180 (2010).
[3] E. Ali, K. Nixon, A. J. Murray, C. G. Ning, J. Colgan and D. Madison, Phys. Rev. A 92, 042711 (2015). 
[4] N. Watanabe, S. Yamada and M. Takahashi, Phys. Chem. Chem. Phys. 20, 1063 (2018).
[5] G. Purohit and D. Kato, Phys. Rev. A 96 (4), 042710 (2017).
[6] G. Purohit, J. Phys. B: At. Mol. Opt. Phys. 54 065203 (2021)
[7] G. Purohit, D. Kato, I. Murakami, Shivani Gupta and P. Sinha, Eur. Phys. J. D 75, 219 (2021).
[8] A. Pandey and G. Purohit, Atoms 10 (2), 50 (2022)