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Accurate Ritz wavelengths of parity-forbidden [FeII], [TiII] and [CrII] infrared lines of astrophysical interest

Aldenius, Maria LU and Johansson, Sveneric LU (2007) In Astronomy & Astrophysics 467. p.152-753
Abstract
Context: With new astronomical infrared spectrographs the demands of accurate atomic data in the infrared have increased. In this

region there is a large amount of parity-forbidden lines, which are of importance in diagnostics of low-density astrophysical plasmas.

Aims: We present improved, experimentally determined, energy levels for the lowest even LS terms of Fe ii, Ti ii and Cr ii, along with

accurate Ritz wavelengths for parity-forbidden transitions between and within these terms.

Methods: Spectra of Fe ii, Ti ii and Cr ii have been produced in a hollow cathode discharge lamp and acquired using high-resolution

Fourier Transform (FT) spectrometry. The energy levels have been determined by... (More)
Context: With new astronomical infrared spectrographs the demands of accurate atomic data in the infrared have increased. In this

region there is a large amount of parity-forbidden lines, which are of importance in diagnostics of low-density astrophysical plasmas.

Aims: We present improved, experimentally determined, energy levels for the lowest even LS terms of Fe ii, Ti ii and Cr ii, along with

accurate Ritz wavelengths for parity-forbidden transitions between and within these terms.

Methods: Spectra of Fe ii, Ti ii and Cr ii have been produced in a hollow cathode discharge lamp and acquired using high-resolution

Fourier Transform (FT) spectrometry. The energy levels have been determined by using observed allowed ultraviolet transitions

connecting the even terms with upper odd terms. Ritz wavelengths of parity-forbidden lines have then been determined.

Results: Energy levels of the four lowest Fe ii terms (a6D, a4F, a4D and a4P) have been determined, resulting in 97 different parityforbidden

transitions with wavelengths between 0.74 and 87 µm. For Ti ii the energy levels of the two lowest terms (a4F and b4F)

have been determined, resulting in 24 different parity-forbidden transitions with wavelengths between 8.9 and 130 µm. Also for Cr ii

the energy levels of the two lowest terms (a6S and a6D) have been determined, in this case resulting in 12 different parity-forbidden

transitions with wavelengths between 0.80 and 140 µm. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
methods: laboratory, line: profiles, infrared: general, atomic data, techniques: spectroscopic
in
Astronomy & Astrophysics
volume
467
pages
152 - 753
publisher
EDP Sciences
external identifiers
  • wos:000246424900039
  • scopus:34249321652
ISSN
0004-6361
DOI
10.1051/0004-6361:20077108
language
English
LU publication?
yes
id
c2af68b8-cf59-4dcd-87c0-88b4d852da8c (old id 618528)
date added to LUP
2007-11-26 17:19:03
date last changed
2017-01-01 07:55:54
@article{c2af68b8-cf59-4dcd-87c0-88b4d852da8c,
  abstract     = {Context: With new astronomical infrared spectrographs the demands of accurate atomic data in the infrared have increased. In this<br/><br>
region there is a large amount of parity-forbidden lines, which are of importance in diagnostics of low-density astrophysical plasmas.<br/><br>
Aims: We present improved, experimentally determined, energy levels for the lowest even LS terms of Fe ii, Ti ii and Cr ii, along with<br/><br>
accurate Ritz wavelengths for parity-forbidden transitions between and within these terms.<br/><br>
Methods: Spectra of Fe ii, Ti ii and Cr ii have been produced in a hollow cathode discharge lamp and acquired using high-resolution<br/><br>
Fourier Transform (FT) spectrometry. The energy levels have been determined by using observed allowed ultraviolet transitions<br/><br>
connecting the even terms with upper odd terms. Ritz wavelengths of parity-forbidden lines have then been determined.<br/><br>
Results: Energy levels of the four lowest Fe ii terms (a6D, a4F, a4D and a4P) have been determined, resulting in 97 different parityforbidden<br/><br>
transitions with wavelengths between 0.74 and 87 µm. For Ti ii the energy levels of the two lowest terms (a4F and b4F)<br/><br>
have been determined, resulting in 24 different parity-forbidden transitions with wavelengths between 8.9 and 130 µm. Also for Cr ii<br/><br>
the energy levels of the two lowest terms (a6S and a6D) have been determined, in this case resulting in 12 different parity-forbidden<br/><br>
transitions with wavelengths between 0.80 and 140 µm.},
  author       = {Aldenius, Maria and Johansson, Sveneric},
  issn         = {0004-6361},
  keyword      = {methods: laboratory,line: profiles,infrared: general,atomic data,techniques: spectroscopic},
  language     = {eng},
  pages        = {152--753},
  publisher    = {EDP Sciences},
  series       = {Astronomy & Astrophysics},
  title        = {Accurate Ritz wavelengths of parity-forbidden [FeII], [TiII] and [CrII] infrared lines of astrophysical interest},
  url          = {http://dx.doi.org/10.1051/0004-6361:20077108},
  volume       = {467},
  year         = {2007},
}