Effect of spin—orbit states of Kr~+ and Xe~+ on the single-electron capture spectra of C~(2+) ions

摘要

High resolution translational energy spectra have been obtained for state-selective single-electron capture by 8 keV C2+ in Ar and 6 keV C2+ in Kr and Xe. The Ar spectrum displays 12 well-resolved peaks which fall into two sequences corresponding to capture from the ground 1S state and the metastable 3P0 state of the C2+ ion. The only two capture channels which violate spin conservation in this range of energy gain are notably absent from this spectrum. The effect of spin—orbit splitting (0.18 eV) of the 2P3/2,1/2 ground state of the Ar+ ion is not apparent in this spectrum. By contrast the spin—orbit splitting of the 2P3/2,1/2 states of the Kr+ (at 0.67 eV) and Xe+ (at 1.31 eV) ions is strongly reflected in the respective spectra. The Kr+ spectrum reveals six pairs of neatly arranged doublet peaks, while the Xe+ spectrum displays a less obvious relationship between the doublets.