Frequency calibration of B 1Σ+u X 1Σ+g (6,0) Lyman transitions in H2 for comparison with quasar data

Details Frequency calibration of B 1Σ+u X 1Σ+g (6,0) Lyman transitions in H2 for comparison with quasar data Frequency calibration of B 1Σ+u X 1Σ+g (6,0) Lyman transitions in H2 for comparison with quasar data

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jphb...41c5702i&link_type=abstract

Journal of Physics B: Atomic, Molecular, and Optical Physics, Volume 41, Issue 3, pp. 035702 (2008).

Physics

6

Scientific paper

The Lyman and Werner spectroscopic transitions of molecular hydrogen, the most ubiquitous molecular spectral lines observed in the universe, provide a tool to probe a possible variation of the proton-to-electron mass ratio μ on a cosmological time scale. Such procedures require a database of zero-redshift, or laboratory-based wavelengths at the highest possible level of accuracy. Accurate transitions in the B 1Σ+u X 1Σ+g (6,0) Lyman band of H2 are still missing in the set of laboratory data, due to previously encountered problems in generating the appropriate wavelengths using a narrow-band extreme ultraviolet laser source. Here frequency calibrations of the missing transitions are presented from a laser-based study at a (5 8) × 10-8 accuracy level.

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