Improved Laboratory Values of the H2 Lyman and Werner Lines for Constraining Time Variation of the Proton-to-Electron Mass Ratio

Details Improved Laboratory Values of the H2 Lyman and Werner Lines for Constraining Time Variation of the Proton-to-Electron Mass Ratio Improved Laboratory Values of the H2 Lyman and Werner Lines for Constraining Time Variation of the Proton-to-Electron Mass Ratio

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phrvl.101v3001s&link_type=abstract

Physical Review Letters, vol. 101, Issue 22, id. 223001

Physics

16

Molecular Spectra, Determination Of Fundamental Constants, Atomic Processes And Interactions, Origin And Formation Of The Universe

Scientific paper

Two distinct high-accuracy laboratory spectroscopic investigations of the H2 molecule are reported. Anchor lines in the EFΣg+1-XΣg+1 system are calibrated by two-photon deep-UV Doppler-free spectroscopy, while independent Fourier-transform spectroscopic measurements are performed that yield accurate spacings in the BΣu+1-EFΣg+1 and IΠg1-CΠu1 systems. From combination differences accurate transition wavelengths for the B-X Lyman and the C-X Werner lines can be determined with accuracies better than ˜5×10-9, representing a major improvement over existing values. This metrology provides a practically exact database to extract a possible variation of the proton-to-electron mass ratio based on H2 lines in high-redshift objects. Moreover, it forms a rationale for equipping a future class of telescopes, carrying 30 40 m dishes, with novel spectrometers of higher resolving powers.

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