Ionization of noble gas by impact of hydrogen anions

Institute of Modern Physics, Fudan University - Shanghai 200433, China and Applied Ion Beam Physics Laboratory, Fudan University, Key Laboratory of the Ministry of Education - China

^(a) zhangxm@fudan.edu.cn

Received: 25 August 2012
Accepted: 17 October 2012

Abstract

Relative cross-sections for double ionization and single ionization of targets under the impact of hydrogen anions were measured. Two systems were investigated, H⁻ projectiles with Kr and Xe targets. The energy region was 10–30 keV. Recoil ions originated from target (Kr⁺, Kr²⁺, Xe⁺, Xe²⁺) were detected in coincidence with projectiles in several final charge states (q = 0 and q = + 1). We compare the present results with the previous results of Ar. The results show that the cross-section ratios, taken between double and single ionization of Ar, Kr and X in the channels of single and double electron loss of H⁻, become larger and larger with the incident energy increasing, and that the cross-section ratios will cross at some certain energy for the two different electron loss channels. The crossing energy for Xe is about 23 keV.