Ionization and electron capture in collisions of bare carbon ions with hydrogen

Abstract

Ionization and electron capture in collisions of bare carbon ions with atomic hydrogen has been studied using the wavepacket continuum discretization approach. The three-body Schrödinger equation governing the collision process is solved using the two-center expansion of the total scattering wavefunction. Calculations have been performed for the projectile energy range from 1 keV/amu to 10 MeV/amu. While there is excellent agreement with experimental data for the total electroncapture cross section over the entire energy range, the calculated total ionization cross section slightly overestimates the only available measured point. The singly and doubly differential ionization cross sections at 1 and 2.5 MeV/amu are in good agreement with experiment. The differential cross section calculations are extended to lower energies where perturbative methods are expected to fail. At 100 keV/amu impact energy the present singly differential cross section in the ejected angle of the electron shows a pronounced peak in the forward direction. It is concluded that at low incident energies electron capture into the continuum of the projectile strongly enhances electron ejection in the forward direction.

Integrated total and state-selective cross sections for bare beryllium ion collisions with atomic hydrogen

“…A more detailed description of the formalism has been outlined in [20,21,27]. It has been generalised to multiply charged bare ions with hydrogen-like targets in [25]. In the semiclassical approximation the motion of the bare ion projectile is treated with a straight line trajectory, while the target electron-nucleus system is treated fully quantum mechanically with the nucleus at the origin.…”

“…In this implementation wave packet pseudostates are used to discretise the continuum. The method has been applied extensively to many systems in previous works, such as proton-hydrogen [22,23], bare helium ion-hydrogen [24] and bare multiply charged ion-hydrogen [25] collisions along with proton collisions with multi electron targets [26]. In those particular studies, the WP-CCC scheme has produced accurate results over a broad energy region and compared favourably with available experimental data.…”

One-center close-coupling approach to two-center rearrangement collisions

“…Our previous studies of ion-atom collisions were based on the quantum-mechanical [30,31] and semiclassical [32][33][34][35][36] versions of the convergent close-coupling (CCC) approach which, depending on the collision system and the type of cross sections under consideration, utilized the basis of either Laguerre or wave-packet pseudostates. All of these implementations of the CCC approach are based on the two-center AOCC formalism meaning that the total scattering wave function satisfying the Schrödinger equation is sought by expanding it in terms of target-and projectile-centered pseudostates.…”

Electron Capture and Ionisation in Collisions of Ne10+ and Li3+ with Atomic Hydrogen

“…Here we provide a brief overview of the WP-CCC method. The details of the theory have been given in [5,31,33].…”

“…The WP-CCC method [4,5] has been employed to calculate cross sections for various ion-atom collisional systems over a wide energy range. These collisional processes include protons incident on atomic [26,27] and molecular hydrogen [28,29], multiply charged ion projectiles incident on atomic targets [30][31][32][33] and proton collisions with helium [34][35][36].…”