Precise laboratory wavelengths of the Mg I and Mg II resonance transitions at 2853, 2803 and 2796 Angstroms

Details Precise laboratory wavelengths of the Mg I and Mg II resonance transitions at 2853, 2803 and 2796 Angstroms Precise laboratory wavelengths of the Mg I and Mg II resonance transitions at 2853, 2803 and 2796 Angstroms

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.300..131p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 300, Issue 1, pp. 131-134.

Astronomy and Astrophysics

Astronomy

27

Atomic Data, Line: Profiles, Methods: Laboratory, Techniques: Spectroscopic, Quasars: Absorption Lines, Ultraviolet: General

Scientific paper

Strong ultraviolet resonance transitions are observed routinely both in the Galactic interstellar medium and in quasar absorption systems. The quality of the astronomical spectroscopic data now available demands more precise laboratory rest wavelengths. Of particular interest is the accuracy with which one can constrain space-time variations in fundamental constants using quasar spectra. A recent analysis by Webb et al. of 25 quasar spectra using Mg and Fe transitions tentatively suggests that the fine-structure constant was smaller at earlier epochs. To permit a check on this result, and to allow further more extensive investigations, we have carried out a new determination of the laboratory wavelengths of Mg I 2853 Angstroms, Mg II 2796 Angstroms and Mg II 2803 Angstroms by high-resolution Fourier transform spectroscopy. Our results for Mg II 2796 Angstroms are consistent with the value measured independently by two other groups. To our knowledge, no previous measurements of comparable precision exist for Mg I 2853 Angstroms and Mg II 2803 Angstroms.

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