Measurement of Absolute Single and Double Electron Capture Cross Sections for O6+ Ion Collisions with CO2, CH4, H-2, and N-2

摘要

The absolute electron capture cross sections for single and double charge exchanges (CEs) between the highly charged ion O6+ and CO2, CH4, H-2, and N-2, the dominant collision processes in the solar wind, have been measured in the energies from 7 keV q (2.63 keV u(-1)) to 52 keV q (19.5 keV u(-1)). These measurements were carried out in the new experimental instrument setup at Fudan University, and the errors of the cross sections for single and double CEs at the 1 sigma confidence level were about 11% and 16%, respectively. Limited agreement is achieved with single electron capture results calculated by the classical overbarrier model. These cross section data are useful for the simulation of ion-neutral processes in astrophysical environments and to improve the present theoretical model of fundamental atomic processes.