Absolute cross section for [Formula Presented] electron-impact excitation

P. H. Janzen, L. D. Gardner, D. B. Reisenfeld, J. L. Kohl

Research output: Contribution to journalArticlepeer-review

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We have measured the absolute energy-averaged cross section for electron-impact excitation of [Formula Presented] from energies below threshold to the turn-on of the [Formula Presented] transition. A beams modulation technique with inclined electron and ion beams was used. Radiation at 120.65 nm from the decay of the excited ions to the [Formula Presented] ground state was detected using an absolutely calibrated optical system. The fractional population of metastable [Formula Presented] in the incident ion beam was determined to be [Formula Presented] The experimental energy spread ranged from 0.85 eV (full width at half maximum) at the lowest energies to 0.56 eV at the highest. Resonance features consistent with 12-state close-coupling R-matrix calculations are seen.

Original languageEnglish
Pages (from-to)7
Number of pages1
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number5
StatePublished - 2003


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