Single and Multiple Ionization of Methane Molecules by Antiproton, Proton and Hydrogen-Atom Impact.

P.N. TEREKHIN; M. A. QUINTO; J.M. MONTI; O.A. FOJÓN; R. D. RIVAROLA

Lisbon

Conferencia; 19th International Conference Physics of Highly Charged Ions; 2018

The study of multiple-electron reactions produced by the impact of ion beams and neutral atomic projectiles on molecular targets is of great importance in both experimental and theoretical physics. In particular, there is a big attention to its application in radiotherapy [1] and atmospheric science [2]. Apart from water and DNA-like structures, living matter consists of other molecules as CH4, N2, CO, CO2, O2.The aim of the present work is focused on theoretical calculations of single-and multiple-electron processes of the simplest gydrocarbon molecule CH4 colliding with antiproton, proton and hydrogen-atom impact at intermediate and high collision energies. We used a prior-version of the three-body Continuum Distorted Wave-Eikonal Initial State approximation (3B-CDW-EIS) [3] to obtain the total cross sections. The initial wavefunctions of the active electrons bound to a particular water molecular orbital are described employing the complete neglect of the differential overlap (CNDO) approximation [4]. Multiple-electron transitions are determined using a statistical multinomial distribution. The simplest dynamics occurs for the case antiproton impact, because a pure ionization is the unique reaction channel. Hydrogen-atom was selected to investigate influence structured projectiles on multiple-electron processes.We compare our results for different projectiles with available theoretical studies and experimental data. The developed approach may be used to investigate multiple-electron processes of more complex molecules such as DNA components.