Experimental and theoretical studies of excited states in Ir
(2021) In Physical Review A 103(6).- Abstract
The properties of atomic negative ions are to a large extent determined by electron-electron correlation which makes them an ideal testing ground for atomic many-body physics. In this paper, we present a detailed experimental and theoretical study of excited states in the negative ion of iridium. The ions were stored at cryogenic temperatures using the double electrostatic ion ring experiment facility at Stockholm University. Laser photodetachment was used to monitor the relaxation of three bound excited states belonging to the [Xe] 4f145d86s2 ionic ground configuration. Our measurements show that the first excited state has a lifetime much longer than the ion-beam storage time of 1230±100s. The binding energy of this state was measured... (More)
The properties of atomic negative ions are to a large extent determined by electron-electron correlation which makes them an ideal testing ground for atomic many-body physics. In this paper, we present a detailed experimental and theoretical study of excited states in the negative ion of iridium. The ions were stored at cryogenic temperatures using the double electrostatic ion ring experiment facility at Stockholm University. Laser photodetachment was used to monitor the relaxation of three bound excited states belonging to the [Xe] 4f145d86s2 ionic ground configuration. Our measurements show that the first excited state has a lifetime much longer than the ion-beam storage time of 1230±100s. The binding energy of this state was measured to be 1.045±0.002eV. The lifetimes of the second and third excited states were experimentally determined to be 133±10 and 172±35ms, respectively. Multiconfiguration Dirac-Hartree-Fock calculations were performed in order to extract binding energies and lifetimes. These calculations predict the existence of the third excited bound state that was detected experimentally. The computed lifetimes for the three excited bound states agree well with the experimental results and allow for a clear identification of the detected levels.
(Less)
- author
- organization
- publishing date
- 2021
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review A
- volume
- 103
- issue
- 6
- article number
- 062806
- publisher
- American Physical Society
- external identifiers
-
- scopus:85108173061
- ISSN
- 2469-9926
- DOI
- 10.1103/PhysRevA.103.062806
- language
- English
- LU publication?
- yes
- id
- 49dc399e-55c4-4f90-94c0-c3f662011262
- date added to LUP
- 2021-07-16 11:07:38
- date last changed
- 2022-04-27 02:47:35
@article{49dc399e-55c4-4f90-94c0-c3f662011262,
abstract = {{<p>The properties of atomic negative ions are to a large extent determined by electron-electron correlation which makes them an ideal testing ground for atomic many-body physics. In this paper, we present a detailed experimental and theoretical study of excited states in the negative ion of iridium. The ions were stored at cryogenic temperatures using the double electrostatic ion ring experiment facility at Stockholm University. Laser photodetachment was used to monitor the relaxation of three bound excited states belonging to the [Xe] 4f145d86s2 ionic ground configuration. Our measurements show that the first excited state has a lifetime much longer than the ion-beam storage time of 1230±100s. The binding energy of this state was measured to be 1.045±0.002eV. The lifetimes of the second and third excited states were experimentally determined to be 133±10 and 172±35ms, respectively. Multiconfiguration Dirac-Hartree-Fock calculations were performed in order to extract binding energies and lifetimes. These calculations predict the existence of the third excited bound state that was detected experimentally. The computed lifetimes for the three excited bound states agree well with the experimental results and allow for a clear identification of the detected levels.</p>}},
author = {{Kristiansson, M. K. and Schiffmann, S. and Grumer, J. and Karls, J. and De Ruette, N. and Eklund, G. and Ideböhn, V. and Gibson, N. D. and Brage, T. and Zettergren, H. and Hanstorp, D. and Schmidt, H. T.}},
issn = {{2469-9926}},
language = {{eng}},
number = {{6}},
publisher = {{American Physical Society}},
series = {{Physical Review A}},
title = {{Experimental and theoretical studies of excited states in Ir}},
url = {{http://dx.doi.org/10.1103/PhysRevA.103.062806}},
doi = {{10.1103/PhysRevA.103.062806}},
volume = {{103}},
year = {{2021}},
}