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Hyperfine-dependent lifetimes in Be-like ions

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Author

Summary, in English

Theoretical investigations of hyperfine quenching of the two metastable levels 1s(2)2s2p P-3(0) and P-3(2) have been performed along the Be-like isoelectronic sequence for ions between Z=6-22. It is shown that the lifetime of the latter level is sensitive to hyperfine quenching in the beginning of the isoelectronic sequence, but the sensitivity decreases towards the high-Z end. It is also shown that the hyperfine dependent branching fraction between the 2s(2) S-1(0)-2s2p P-3(2) and the 2s2p P-3(1)-2s2p P-3(2) transitions can lead to some rather drastic changes in the spectra. Our predicted value of 0.677 s(-1) for the hyperfine-induced 2s(2) S-1(0)-2s2p P-3(0) transition rate for Ti-47(18+) are in disagreement with a recent experimental value of 0.56(3) s(-1). Our calculated values of this quenching are in agreement with other recent calculations all along the sequence.

Publishing year

2009

Language

English

Publication/Series

Physical Review A (Atomic, Molecular and Optical Physics)

Volume

79

Issue

3

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Keywords

  • ions
  • positive
  • metastable states
  • hyperfine structure
  • isoelectronic series
  • radiative lifetimes

Status

Published

ISBN/ISSN/Other

  • ISSN: 1050-2947