The FERRUM project: Experimental lifetimes and transition probabilities from highly excited even 4d levels in Fe II
Hartman, Henrik LU
; Nilsson, Hampus
LU
; Engström, Lars
LU
and Lundberg, Hans
LU
(2015)
In Astronomy & Astrophysics
584.
- Abstract
- We report lifetime measurements of the 6 levels in the 3d(6)(5D)4d e(6)G term in Fe II at an energy of 10.4 eV, and f-values for 14 transitions from the investigated levels. The lifetimes were measured using time-resolved laser-induced fluorescence on ions in a laser-produced plasma. The high excitation energy, and the fact that the levels have the same parity as the the low-lying states directly populated in the plasma, necessitated the use of a two-photon excitation scheme. The probability for this process is greatly enhanced by the presence of the 3d(6)(D-5)4p z(6)F levels at roughly half the energy difference. The f-values are obtained by combining the experimental lifetimes with branching fractions derived using relative intensities... (More)
- We report lifetime measurements of the 6 levels in the 3d(6)(5D)4d e(6)G term in Fe II at an energy of 10.4 eV, and f-values for 14 transitions from the investigated levels. The lifetimes were measured using time-resolved laser-induced fluorescence on ions in a laser-produced plasma. The high excitation energy, and the fact that the levels have the same parity as the the low-lying states directly populated in the plasma, necessitated the use of a two-photon excitation scheme. The probability for this process is greatly enhanced by the presence of the 3d(6)(D-5)4p z(6)F levels at roughly half the energy difference. The f-values are obtained by combining the experimental lifetimes with branching fractions derived using relative intensities from a hollow cathode discharge lamp recorded with a Fourier transform spectrometer. The data is important for benchmarking atomic calculations of astrophysically important quantities and useful for spectroscopy of hot stars. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/8545722
- author
- Hartman, Henrik
LU
; Nilsson, Hampus
LU
; Engström, Lars
LU
and Lundberg, Hans
LU
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- atomic data, methods: laboratory: atomic, techniques: spectroscopic
- in
- Astronomy & Astrophysics
- volume
- 584
- article number
- A24
- publisher
- EDP Sciences
- external identifiers
-
- wos:000366936800024
- scopus:84947550247
- ISSN
- 0004-6361
- DOI
- 10.1051/0004-6361/201525738
- language
- English
- LU publication?
- yes
- id
- 9bf40f7c-da61-4852-aabd-87d9dad3d2ad (old id 8545722)
- date added to LUP
- 2016-04-01 13:06:33
- date last changed
- 2024-01-09 07:37:40
@article{9bf40f7c-da61-4852-aabd-87d9dad3d2ad,
abstract = {{We report lifetime measurements of the 6 levels in the 3d(6)(5D)4d e(6)G term in Fe II at an energy of 10.4 eV, and f-values for 14 transitions from the investigated levels. The lifetimes were measured using time-resolved laser-induced fluorescence on ions in a laser-produced plasma. The high excitation energy, and the fact that the levels have the same parity as the the low-lying states directly populated in the plasma, necessitated the use of a two-photon excitation scheme. The probability for this process is greatly enhanced by the presence of the 3d(6)(D-5)4p z(6)F levels at roughly half the energy difference. The f-values are obtained by combining the experimental lifetimes with branching fractions derived using relative intensities from a hollow cathode discharge lamp recorded with a Fourier transform spectrometer. The data is important for benchmarking atomic calculations of astrophysically important quantities and useful for spectroscopy of hot stars.}},
author = {{Hartman, Henrik and Nilsson, Hampus and Engström, Lars and Lundberg, Hans}},
issn = {{0004-6361}},
keywords = {{atomic data; methods: laboratory: atomic; techniques: spectroscopic}},
language = {{eng}},
publisher = {{EDP Sciences}},
series = {{Astronomy & Astrophysics}},
title = {{The FERRUM project: Experimental lifetimes and transition probabilities from highly excited even 4d levels in Fe II}},
url = {{http://dx.doi.org/10.1051/0004-6361/201525738}},
doi = {{10.1051/0004-6361/201525738}},
volume = {{584}},
year = {{2015}},
}