Abstract

Rate coefficients for the ion–ion recombination process Xe++F−+He→XeF*+He have been determined in ambient helium gas in the density range from 0.2 to 0.7 NL (Loschmidt’s number NL=2.687×1019 cm−3). The experimental methods consisted of observing the conductivity decay during the afterglow of a photoionized plasma, in conjunction with mass spectrometry of plasma ions and optical spectroscopy of the XeF* excimer radiation. The measured rate coefficients agree well with theoretical results by Bates and Mendaš and Monte Carlo simulations by Morgan et al.

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