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Spectroscopic analysis of visible and near UV light emitted by Ar7+ and Ar6+ ions produced in Ar8+ -He and Ar8+ -H2 collisions at 120 keV

A spectroscopic analysis of light emitted in the 2000-6000 Å wavelength range by Ar7+ and Ar6+ ions produced in Ar8+ -He and Ar8+ -H2 collisions at 120 keV is performed. Well resolved fine structure components of 5s-5p and 5p-5d transitions in Ar VIII following single electron capture are precisely measured. Predominant lines due to double electron capture are observed. In particular, strong lines observed both in Ar8+ -He and Ar8+ -H2 collisions are attributed to Rydberg transitions 3snl-3sn'l' in Ar VII. Attempts at identifications are made for the transitions 3dnl-3dn'l' (n=4,5) with the help of ab initio calculations. Photon emission cross sections for individual lines are determined from the measured data.