Charge-transfer processes in collisions of ${\mathrm{He}}^{2+}$ ions with ${\mathrm{H}}_{2},\phantom{\rule{0.3em}{0ex}}{\mathrm{N}}_{2},\phantom{\rule{0.3em}{0ex}}{\mathrm{O}}_{2}$, CO, and $\mathrm{C}{\mathrm{O}}_{2}$ molecules below $4\phantom{\rule{0.3em}{0ex}}\mathrm{keV}∕\mathrm{u}$

Charge-transfer processes in collisions of ${He}^{2 +}$ ions with $H_{2}, N_{2}, O_{2}$ , CO, and $C O_{2}$ molecules below $4 keV ∕ u$

Toshio Kusakabe, Yoshiharu Miyamoto, Mineo Kimura, and Hiroyuki Tawara

Phys. Rev. A 73, 022706 – Published 6 February 2006

Abstract

Single- and double-charge-transfer cross sections of ${}^{3}{He}^{2 +}$ ions in collisions with $N_{2}, O_{2}$ , CO, and $C O_{2}$ molecules have been measured in the energy range of 0.20 to $2.7 keV ∕ u$ . In addition, the same type of measurements for $H_{2}$ molecules has been also carried out again for energies in the range from 0.13 to $0.40 keV ∕ u$ . For all molecules except for $C O_{2}$ , the present single-charge-transfer cross sections are found to be generally larger than, or at least comparable to, double-charge-transfer cross sections in the energy region studied. This is a marked difference in comparison to experimental results reported earlier where a sharp increase for double charge transfer was observed below $0.3 keV ∕ u$ . The double-charge-transfer cross sections are found to be apparently larger than single-charge-transfer cross sections only for $C O_{2}$ molecules at energies below $0.8 keV ∕ u$ . A theoretical analysis based on a close-coupling method within a molecular representation has also been carried out for $H_{2}$ and CO targets to provide some insights.