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Hyperfine-dependent lifetimes in Be-like ions

Andersson, M; Zou, Y.; Hutton, R and Brage, Tomas LU (2009) In Physical Review A (Atomic, Molecular and Optical Physics) 79(3).
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ions, positive, metastable states, hyperfine structure, isoelectronic series, radiative lifetimes
in
Physical Review A (Atomic, Molecular and Optical Physics)
volume
79
issue
3
publisher
American Physical Society (APS)
external identifiers
  • wos:000264770200073
  • scopus:64849103325
ISSN
1050-2947
DOI
10.1103/PhysRevA.79.032501
language
English
LU publication?
yes
id
85274d3f-4394-49b1-adff-b674d28af8ca (old id 1400514)
date added to LUP
2009-06-12 11:27:18
date last changed
2017-11-12 03:20:18
@article{85274d3f-4394-49b1-adff-b674d28af8ca,
  abstract     = {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.},
  articleno    = {032501},
  author       = {Andersson, M and Zou, Y. and Hutton, R and Brage, Tomas},
  issn         = {1050-2947},
  keyword      = {ions,positive,metastable states,hyperfine structure,isoelectronic series,radiative lifetimes},
  language     = {eng},
  number       = {3},
  publisher    = {American Physical Society (APS)},
  series       = {Physical Review A (Atomic, Molecular and Optical Physics)},
  title        = {Hyperfine-dependent lifetimes in Be-like ions},
  url          = {http://dx.doi.org/10.1103/PhysRevA.79.032501},
  volume       = {79},
  year         = {2009},
}