Absolute single photoionization cross-section measurements of Se 3+ and Se 5+

D. A. Esteves, A. Aguilar, R. C. Bilodeau, R. A. Phaneuf, A. L.D. Kilcoyne, E. C. Red, N. C. Sterling

Research output: Contribution to journalArticlepeer-review

Abstract

Absolute single photoionization cross-section measurements of Se 3+ and Se 5+ ions were performed using monochromatized synchrotron radiation and the photo-ion merged-beams technique. Se 3 + measurements were made at a photon energy resolution of 20 ± 3 meV from 41.90 to 54.56 eV, spanning the 2P 1/2 ground state ionization threshold. Numerous autoionizing resonances arising from both the 2P 1/2 ground state and 2P 3/2 metastable state are identified using quantum defect analysis. For Se 5 +, measurements were made at a photon energy resolution of 60 ± 10 meV from 81 to 101 eV, spanning the 2S 1/2 ground state ionization threshold, and at a photon energy resolution of 28 ± 3 meV from 100.175 to 106.675 eV in a region rich with autoionizing resonances. The direct ionization threshold of the Se 5 + 2S 1/2 ground state is experimentally determined to be 81.780 ± 0.010 eV.

Original languageEnglish
Article number115201
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume45
Issue number11
DOIs
StatePublished - Jun 14 2012

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