Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.373l..41s&link_type=abstract
Monthly Notices of the Royal Astronomical Society: Letters, Volume 373, Issue 1, pp. L41-L44.
Astronomy and Astrophysics
Astronomy
14
Atomic Data, Methods: Laboratory, Techniques: Spectroscopic, Quasars: Absorption Lines, Ultraviolet: General
Scientific paper
We have performed high-precision spectroscopy on the 3s2 1S ->3s3p 1P first resonance line of MgI at 285 nm. This measurement is motivated by the recent studies comparing observed quasar absorption lines with laboratory measurements in the search for a possible variation of the fine structure constant α. The Mg transition is excited using the up-converted radiation of an injection-seeded Ti:sapphire pulsed laser system, while the frequency of the continuous wave seed light is measured using a femtosecond frequency comb laser. The line positions of the isotopes are fully resolved and have accuracies better than 8 × 10-9. Using terrestrial abundances for the Mg isotopes 24Mg:25Mg:26Mg of 78.99:10.00:11.01, we determine the composite line wavenumber to be 35051.2808(2) cm-1, which can be compared to the astronomical observations where the isotopic shifts are unresolved.
Eikema Kjeld S. E.
Hannemann S.
Salumbides Edcel J.
Ubachs Wim
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