Abstract
Noble gas halide ions are observed mass spectrometrically in low-pressure discharges of noble gas halide mixtures like Kr+Cl2 and Ar+Cl2. Under similar discharge conditions, KrCl+ forms more readily than ArCl+. The most probable process of producing KrCl+ is three-body association of Kr to Cl+ with an estimated rate coefficient of 4×10−28cm6s−1. ArCl+ cannot be formed in this way because the recombination energy of Cl+ is too low by ≳1 eV. KrF+ is observed weakly in Kr+CF4 or Kr+SF6 mixtures. ArI+ can only be observed when Ar+I2 mixtures are traversed by accelerated electrons and the ArI+ ions are not allowed to collide with neutrals or electrons. A negative peak of mass number 59 observed in Ar+CF4 could be ArF−, but is probably an impurity like C2OF−.
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