Symmetric charge transfer in argon, krypton and xenon: the effect of spin-orbit coupling studied using photoelectron-photoion coincidence spectroscopy

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Abstract
A photoion-photoelectron coincidence technique for studying the effect of projectile ion internal energy on atomic collision cross sections is described in detail. The technique is used to assess the effect of spin-orbit coupling on symmetric charge transfer in the rare gases argon, krypton and xenon within the collision energy range 5-1000 eV. The ratio of the cross section for the two spin-orbit levels of the ground-state ion, sigma (2P12/)/ sigma (2P32/) was found to be relatively insensitive to collision energy and just measurably less than unity for argon, 0.90+or-0.05 for krypton and 0.80+or-0.05 for xenon. These results extend and confirm previous data obtained by a non-coincidence photoionisation technique and also agree well with current theoretical predictions.