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1989•Le Journal de Physique ColloquesOpen access

HIGH-RESOLUTION MEASUREMENTS OF ELECTRON-IMPACT IONIZATION CROSS SECTIONS FOR LI-LIKE IONS

A. Müller, G. Hofmann, K. Tinschert, E. Salzborn

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Abstract

For crossed electron and ion beams we have developed an experimental technique which allows to measure cross sections for electron impact ionization of ions with relative uncertainties less than 0.1 %. At this level of accuracy it is possible to do ion spectroscopy of intermediate excited states contributing to net ionization via single and multiple autoionization processes. For ions B2+, C3+, N4+ and O5+ along the Li isoelectronic sequence we have performed quantitative measurements of state-resolved contributions from excitation-autoionization (EA), resonant-excitation-double autoionization (REDA) and resonant-excitation auto-double-ionization (READI).

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For crossed electron and ion beams we have developed an experimental technique which allows to measure cross sections for electron impact ionization of ions with relative uncertainties less than 0.1 %. At this level of accuracy it is possible to do ion spectroscopy of intermediate excited states contributing to net ionization via single and multiple autoionization processes. For ions B2+, C3+, N4+ and O5+ along the Li isoelectronic sequence we have performed quantitative measurements of state-resolved contributions from excitation-autoionization (EA), resonant-excitation-double autoionization (REDA) and resonant-excitation auto-double-ionization (READI).

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Available abstract

For crossed electron and ion beams we have developed an experimental technique which allows to measure cross sections for electron impact ionization of ions with relative uncertainties less than 0.1 %. At this level of accuracy it is possible to do ion spectroscopy of intermediate excited states contributing to net ionization via single and multiple autoionization processes. For ions B2+, C3+, N4+ and O5+ along the Li isoelectronic sequence we have performed quantitative measurements of state-resolved contributions from excitation-autoionization (EA), resonant-excitation-double autoionization (REDA) and resonant-excitation auto-double-ionization (READI).

Key concepts: Autoionization, Electron ionization, Atomic physics, Ionization, Ion, Excited state, Excitation, Chemistry

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