The emission spectrum of ArXe + from a supersonic jet discharge

Abstract

Ultraviolet and visible emission spectra from a d.c. discharge in supersonically expanding mixtures of Ar and Xe have been photographed under medium and high resolution. The low rotational temperature of the spectra facilitates the vibrational analyses of five band systems previously observed by Y. Tanaka, K. Yoshino, and D. E. Freeman [ J. Chem. Phys. 62, 4484–4496 (1975)] and interpreted by them as charge-transfer transitions of ArXe +. Four of the systems share two upper and two lower states. The fifth system has no state in common, but is linked to the other four band groups by fragments of a weak sixth system. The energies of all six ω components arising from Ar( 1S) + Xe +( 2P) and Ar +( 2P) + Xe( 1S) have been established. The ground state dissociation energy D 0 0 = 1445 ± 30cm −1 (0.179 ± 0.004 eV) was derived by extrapolation from the observed vibrational levels, taking into account the long-range behavior of the ion-atom interaction.