Journal Article

Reference ultraviolet wavelengths of Cr <span class="smallCaps">iii</span> measured by Fourier transform spectrometry

D. G. Smillie, J. C. Pickering and P. L. Smith

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 390, issue 2, pages 733-740
Published in print October 2008 | ISSN: 0035-8711
Published online October 2008 | e-ISSN: 1365-2966 | DOI:
Reference ultraviolet wavelengths of Cr iii measured by Fourier transform spectrometry

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We report Cr iii ultraviolet (UV) transition wavelengths measured using a high-resolution Fourier transform spectrometer (FTS), for the first time, available for use as wavelength standards. The doubly ionized iron group element spectra dominate the observed opacity of hot B stars in the UV, and improved, accurate, wavelengths are required for the analysis of astronomical spectra. The spectrum was excited using a chromium–neon Penning discharge lamp and measured with the Imperial College vacuum ultraviolet FTS. 140 classified 3d34s–3d34p Cr iii transition lines, in the spectral range 38 000 to 49 000 cm−1 (2632 to 2041 Å), the strongest having wavelength uncertainties less than one part in 107, are presented.

Keywords: atomic data; line: identification; methods: laboratory

Journal Article.  3369 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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