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Laboratory wavelengths for cosmological constraints on varying fundamental constants

Aldenius, Maria LU (2009) 9th International Conference on Atomic Spectroscopy and Oscillator Strengths for Astrophysical and Laboratory Plasma In Physica Scripta T134. p.014008-014008
Abstract
Cosmological investigations, using high-redshift quasi-stellar object (QSO) absorption spectra, of possible variations of the fine-structure constant (alpha) require very accurate laboratory wavelengths for a number of resonance transitions from several different species. A change in alpha could be detected as a shift in the wavelengths of atomic transitions in the QSO systems and to accurately determine the values of such shifts it is essential that the laboratory rest wavelengths are known to a high degree of accuracy and precision. The present status of such laboratory wavelengths is discussed with emphasis on our recent study including laboratory wavelengths and wavenumbers of ultraviolet (UV) resonance lines from seven species,... (More)
Cosmological investigations, using high-redshift quasi-stellar object (QSO) absorption spectra, of possible variations of the fine-structure constant (alpha) require very accurate laboratory wavelengths for a number of resonance transitions from several different species. A change in alpha could be detected as a shift in the wavelengths of atomic transitions in the QSO systems and to accurately determine the values of such shifts it is essential that the laboratory rest wavelengths are known to a high degree of accuracy and precision. The present status of such laboratory wavelengths is discussed with emphasis on our recent study including laboratory wavelengths and wavenumbers of ultraviolet (UV) resonance lines from seven species, measured using the UV high-resolution Fourier transform spectrometer in Lund. The high relative accuracy of the wavenumbers has been obtained by the use of a composite hollow-cathode light source, which enables the spectra of the different species to be recorded simultaneously and thereby minimizes the effects from several steps of calibration. Much emphasis has been put on investigations of possible wavenumber shifts from line structure and self-absorption as well as pressure shifts and calibration effects. The absolute as well as the relative wavenumber accuracy is discussed and the wavenumbers are compared with values from other investigations. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Physica Scripta
volume
T134
pages
014008 - 014008
publisher
IOP Publishing
conference name
9th International Conference on Atomic Spectroscopy and Oscillator Strengths for Astrophysical and Laboratory Plasma
external identifiers
  • wos:000267612800009
  • scopus:70350635973
ISSN
1402-4896
0031-8949
DOI
10.1088/0031-8949/2009/T134/014008
language
English
LU publication?
yes
id
e055ce18-0ff0-4dab-a39d-2f556ec023f9 (old id 1462950)
date added to LUP
2009-08-18 16:08:30
date last changed
2017-01-01 04:35:22
@inproceedings{e055ce18-0ff0-4dab-a39d-2f556ec023f9,
  abstract     = {Cosmological investigations, using high-redshift quasi-stellar object (QSO) absorption spectra, of possible variations of the fine-structure constant (alpha) require very accurate laboratory wavelengths for a number of resonance transitions from several different species. A change in alpha could be detected as a shift in the wavelengths of atomic transitions in the QSO systems and to accurately determine the values of such shifts it is essential that the laboratory rest wavelengths are known to a high degree of accuracy and precision. The present status of such laboratory wavelengths is discussed with emphasis on our recent study including laboratory wavelengths and wavenumbers of ultraviolet (UV) resonance lines from seven species, measured using the UV high-resolution Fourier transform spectrometer in Lund. The high relative accuracy of the wavenumbers has been obtained by the use of a composite hollow-cathode light source, which enables the spectra of the different species to be recorded simultaneously and thereby minimizes the effects from several steps of calibration. Much emphasis has been put on investigations of possible wavenumber shifts from line structure and self-absorption as well as pressure shifts and calibration effects. The absolute as well as the relative wavenumber accuracy is discussed and the wavenumbers are compared with values from other investigations.},
  author       = {Aldenius, Maria},
  booktitle    = {Physica Scripta},
  issn         = {1402-4896},
  language     = {eng},
  pages        = {014008--014008},
  publisher    = {IOP Publishing},
  title        = {Laboratory wavelengths for cosmological constraints on varying fundamental constants},
  url          = {http://dx.doi.org/10.1088/0031-8949/2009/T134/014008},
  volume       = {T134},
  year         = {2009},
}