Low Energy Ion-Neutral Reactions. II. Kr⁺+Kr, Kr⁺+CO and CO⁺+Kr

Abstract

Atomic resonance charge transfer Kr⁺+Kr→Kr+Kr⁺ (1) and molecular near-resonance processes Kr⁺+CO→Kr+CO⁺ (2) and CO⁺+Kr→CO+Kr⁺ (3) were studied by injected-ion drift tube technique in the energy range from 0.04 eV to 3 eV. The cross section of the process (1) was determined as 1.0±0.15×10⁻¹⁴cm² and found to be independent of the collision energy in the range studied. The cross sections of the processes (2) and (3) were found to be also independent of the collision energy and to have nearly equal magnitude of 3.7±0.7×10⁻¹⁵cm² and 3.3±0.7×10⁻¹⁵cm², respectively. The constant behaviour of the cross sections is explained by acceleration effect due to the attractive potential of each system. The large difference of cross section magnitude between the process (1) and the processes (2) or (3) is explained by polarized Franck-Condon factor. The threshold behaviour of the process (2) was seen below 0.1 eV.