Physics – Atomic Physics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..869...37u&link_type=abstract
ATOMIC PHYSICS 20: XX International Conference on Atomic Physics - ICAP 2006. AIP Conference Proceedings, Volume 869, pp. 37-43
Physics
Atomic Physics
Molecular And Chemical Processes And Interactions, Atomic And Molecular Data, Spectra, And Spectral Parameters, Molecular Spectra, Cosmology
Scientific paper
A novel and highly accurate (at the level of Δλ/λ = 5 × 10-8) database of 233 spectral lines in the Lyman and Werner bands of H2 is determined via laboratory spectroscopy employing a narrowband and tunable extreme ultraviolet laser system. Furthermore an updated set of so-called Ki coefficients, representing the sensitivity of each spectral line on a variation of the proton-to-electron mass ratio μ = mp/me are derived for all lines in the H2 spectrum. The laboratory wavelengths and Ki's are used in a comparison with a recent set of highly accurate H2 spectral lines observed in the Q 0347-383 and Q 0405-443 quasars yielding a fractional change in the mass-ratio of Δμ/μ = 2.4 +/- 0.6 × 10-5 (1σ). This result indicates, at a 4σ confidence level, that μ may have decreased in the past 12 billion years.
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