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Resolving a discrepancy between experimental and theoretical lifetimes in atomic negative ions

Brage, Tomas LU and Grumer, Jon LU (2017) In Journal of Physics B: Atomic, Molecular and Optical Physics 50(2).
Abstract

A recent measurement of the lifetime of the excited 3p5 state in the S- negative ion, which is dominated by a forbidden magnetic dipole transition to the 2 P3/ 2 ground state, reveals a discrepancy with earlier theoretical predictions. To investigate this we have performed systematic and large-scale multiconfiguration Dirac-Hartree-Fock calculations for this system. After including a careful treatment of correlation and relativistic effects, we predict a well-converged value for this lifetime, with an uncertainty considerably less than 1%, thereby removing the apparent conflict between theory and experiment. We also show that this result corresponds to the non-relativistic limit in the LS... (More)

A recent measurement of the lifetime of the excited 3p5 state in the S- negative ion, which is dominated by a forbidden magnetic dipole transition to the 2 P3/ 2 ground state, reveals a discrepancy with earlier theoretical predictions. To investigate this we have performed systematic and large-scale multiconfiguration Dirac-Hartree-Fock calculations for this system. After including a careful treatment of correlation and relativistic effects, we predict a well-converged value for this lifetime, with an uncertainty considerably less than 1%, thereby removing the apparent conflict between theory and experiment. We also show that this result corresponds to the non-relativistic limit in the LS coupling approximation for the magnetic dipole transition within this 2 P term. In addition we demonstrate the usefulness of the latter approach for 2 P transitions in O-, Se- and Te-, as well as for analogous M1 transitions within 2 D terms in Ni- and Pt- ions.

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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
atomic structure, bound states, forbidden transitions, lifetimes, negative ions
in
Journal of Physics B: Atomic, Molecular and Optical Physics
volume
50
issue
2
publisher
IOP Publishing
external identifiers
  • scopus:85009091541
  • wos:000391583400001
ISSN
0953-4075
DOI
10.1088/1361-6455/50/2/025001
language
English
LU publication?
yes
id
d21b878c-fa06-48c2-903f-1969072a8034
date added to LUP
2017-02-06 10:18:41
date last changed
2018-01-07 11:48:39
@article{d21b878c-fa06-48c2-903f-1969072a8034,
  abstract     = {<p>A recent measurement of the lifetime of the excited 3p<sup>5</sup> state in the S<sup>-</sup> negative ion, which is dominated by a forbidden magnetic dipole transition to the <sup>2</sup> P<sub>3/ 2</sub> ground state, reveals a discrepancy with earlier theoretical predictions. To investigate this we have performed systematic and large-scale multiconfiguration Dirac-Hartree-Fock calculations for this system. After including a careful treatment of correlation and relativistic effects, we predict a well-converged value for this lifetime, with an uncertainty considerably less than 1%, thereby removing the apparent conflict between theory and experiment. We also show that this result corresponds to the non-relativistic limit in the LS coupling approximation for the magnetic dipole transition within this <sup>2</sup> P term. In addition we demonstrate the usefulness of the latter approach for <sup>2</sup> P transitions in O<sup>-</sup>, Se<sup>-</sup> and Te<sup>-</sup>, as well as for analogous M1 transitions within <sup>2</sup> D terms in Ni<sup>-</sup> and Pt<sup>-</sup> ions.</p>},
  articleno    = {025001},
  author       = {Brage, Tomas and Grumer, Jon},
  issn         = {0953-4075},
  keyword      = {atomic structure,bound states,forbidden transitions,lifetimes,negative ions},
  language     = {eng},
  month        = {01},
  number       = {2},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics B: Atomic, Molecular and Optical Physics},
  title        = {Resolving a discrepancy between experimental and theoretical lifetimes in atomic negative ions},
  url          = {http://dx.doi.org/10.1088/1361-6455/50/2/025001},
  volume       = {50},
  year         = {2017},
}