Journal Article

Wavelengths of Fe <span class="smallCaps">ii</span> lines for studies of time variation of the fine-structure constant

Gillian Nave

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 2, pages 1570-1574
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.20143.x
Wavelengths of Fe ii lines for studies of time variation of the fine-structure constant

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Ritz wavelengths of 27 spectral lines of Fe ii have been obtained from energy levels derived from Fourier transform spectra. The lines selected are observable in absorption spectra from quasi-stellar objects and are important for astronomical tests of the invariance of the fine-structure constant on a cosmological time-scale. By comparing the wavelength calibration in this paper with that of previously published measurements, wavelengths for 21 lines of Mg i, Mg ii, Cr ii, Ti ii, Mn ii, Ni ii and Zn ii have been placed on a scale consistent with the Fe ii Ritz values.

Keywords: atomic data; ultraviolet: general

Journal Article.  3234 words. 

Subjects: Astronomy and Astrophysics

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