Other
Scientific paper
Mar 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011phrvl.106j0801j&link_type=abstract
Physical Review Letters, vol. 106, Issue 10, id. 100801
Other
13
Determination Of Fundamental Constants, Properties Of Molecules, Cosmology
Scientific paper
The 6.7 and 12.2 GHz masers, corresponding to the 51→60A+ and 20→3-1E transitions in methanol (CH3OH), respectively, are among the brightest radio objects in the sky. We present calculations for the sensitivity of these and other transitions in the ground state of methanol to a variation of the proton-to-electron mass ratio. We show that the sensitivity is greatly enhanced due to a cancellation of energies associated with the hindered internal rotation and the overall rotation of the molecule. We find sensitivities of Kμ=-42 and Kμ=-33, for the 51→60A+ and 20→3-1E transitions, respectively. The sensitivities of other transitions in the different isotopologues of methanol range from -88 to 330. This makes methanol a sensitive probe for spatial and temporal variations of the proton-to-electron mass ratio.
Bethlem Hendrick L.
Jansen Paul
Kleiner Isabelle
Ubachs Wim
Xu Li-Hong
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