Abstract
The observation of rare gas cations (Rg +) in the multiphoton ionization of Rg · NO is studied. Kr + and Xe + are produced when exciting via the à state of Rg · NO, addition to Rg · NO +. In contrast, only Xe + is seen when exciting via the C̃ state of Xe · NO, and only Kr · NO + is seen when exciting via the C̃ state of Kr · NO. Ar + is not seen when exciting via either the à or C̃ states of Ar · NO. The production of the different ions is studied as far of laser power by altering the laser intensity and focusing conditions. For excitation via the à state of Kr · NO, it is found that Kr + production is favoured by high laser intensities, with Kr · NO + being favoured by low intensities. Under tight focusing conditions for the one-colour experiments on Kr · NO, Kr + ions are also produced on NO A ← X resonances. Two-colour experimenrs are also performed on Kr · NO. The observation of Kr + on Kr · NO resonances is explained by intracomplex photoinduced charge transfer within the core of a Rydberg state, with collisional charge transfer between NO + and Kr · NO also playing a role. The production of Kr + on NO resonances is explained by photoinduced collisional charge transfer.
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