Resolving a discrepancy between experimental and theoretical lifetimes in atomic negative ions
(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.
(Less)
- author
- Brage, Tomas LU and Grumer, Jon LU
- organization
- publishing date
- 2017-01-28
- 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
- article number
- 025001
- publisher
- IOP Publishing
- external identifiers
-
- wos:000391583400001
- scopus:85009091541
- 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
- 2024-06-09 09:31:13
@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>}},
author = {{Brage, Tomas and Grumer, Jon}},
issn = {{0953-4075}},
keywords = {{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}},
doi = {{10.1088/1361-6455/50/2/025001}},
volume = {{50}},
year = {{2017}},
}