Laser induced fluorescence studies of the charge transfer reactions of N2+with Ar and N2

摘要

The charge transfer reactions of N2+with Ar and N2have been studied using laser induced fluorescence to monitor N2+. The ions were formed initially within a quadrupole ion trap by electron impact of neutral N2. The experimental conditions were varied such that the trapped N2+could be examined under collision free conditions or after experiencing a controlled number of collisions with selected background gas. The ionndash;molecule collisions rapidly altered the internal energy distribution of the trapped N2+and by monitoring these changes charge transfer cross sections for individual initial vibrational states of the N2+with Ar and N2have been estimated. The results show a strong vibrational dependence of the charge transfer cross section in the N2+ndash;N2system and no measureable dependence in the N2+ndash;Ar system.