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Several examples of the relationship between resonant and nonresonant collisional ionization and photoionization, laser intensity, and the ability to saturate both resonant and nonresonant transitions are illustrated. The effects of energy deficit and effective energy overshoot in determining
the dominant ionization pathway are also discussed. An approximation of the lifetime of the virtual level is made, and its relationship to the probability of two-photon nonresonant absorption is discussed. Finally, the theoretical model described above is fitted to the optogalvanic data for
two single-step resonance transitions of Ne to determine the applicability of the model developed for flame LEI to the hollow cathode discharge environment (under our experimental conditions) and to obtain estimates of the collisional ionization rate constant, κ2i,
and photoionization cross section, σ2i.
Department of Chemistry, University of Florida, Gainesville, Florida 32611
Publication date: November 1, 1991
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The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)