Absolute cross sections for electron-impact single ionization of [Formula Presented] (q=2,4–6) ions

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Abstract

Absolute total cross sections for electron-impact single ionization of [Formula Presented] (q=2,4–6) ions have been measured using a crossed-beams technique from below the ground-state ionization threshold to 800 eV with typical total uncertainties near the peak of the cross sections ranging from 9% for [Formula Presented] to 13% for [Formula Presented]. Details of the apparatus and experimental procedures used in this study are presented along with a discussion of the experimental uncertainties. The measured cross sections for all four ions are dominated by direct ionization and are in excellent agreement with the Lotz semiempirical formula. Ionization rate coefficients and fitting parameters calculated from the measured cross sections are also reported.

Original languageEnglish
Pages (from-to)1435-1444
Number of pages10
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume54
Issue number2
DOIs
StatePublished - 1996

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