Calculation of ionization and total and partial charge exchange cross sections for collisions of C6+ and N7+ with H

Abstract

Abstract. We have performed calculations for collisions between fully stripped ions, C 6+ and N 7+ , and atomic hydrogen, in both its ground and first excited energy levels. We have employed the Classical Trajectory Monte Carlo method to obtain total ionization and charge exchange cross sections and state selective charge exchange cross sections in the 5-500 keV/amu energy range.

Comment on “Classical description ofH(1s)andH*(n=2)for cross-secti

“…We show in Fig. 3 similar comparisons for C 6+ + H(1s), including our previous results [15]. In Ref.…”

“…[8], is shown in Fig. 2, where one can note that the results of [8] are very similar to those obtained with the microcanonical distribution, and a better agreement is found between the CTMC results of [15] and the close-coupling calculations of [17], and also with previous theoretical [18,19] and experimental results [20,21], not included in the figure for clarity.…”

“…(1), applied to obtain the partial cross sections, but unlike the case of the HED treatment, high values of n c are used in the HZD. In fact, since n c = Z k for each nuclear charge, one-third of the total number of trajectories belong to excited bins (n c > [15,16] for C 6+ , N 7+ + H(n = 1,2) collisions. The comparison of total electron capture cross sections, not presented in Ref.…”

Uncertainty estimates for theoretical atomic and molecular data

“…At lower energies the discrepancies are larger and different variants of CTMC models give different results [219,222]. This suggests that an uncertainty assessment solely based on CTMC calculations would be difficult in this regime.…”

“…Even though the two-center basis used includes a total of 340 states, which is a very large number for a semiclassical CC calculation, the overestimation is deemed to be a finite-basis effect, i.e. a convergence problem of the AOCC method in this energy range [219,222]. Figure 14 explores the very low energy regime in which straight-line trajectories, and .…”