Sensitivity to electron-to-proton mass ratio variation from 12 C2H2 rovibrational transitions to v 1 + v 3 and v 1 + v 2 + v 4 + v 5 interacting levels

Florin Lucian Constantin (1)

1 PhLAM - Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523

Calculations of the sensitivity to a variation of the electron-to-proton mass ratio μ for 12C2H2 transitions of the v1 + v3 and v1 + v2 + v4 + v5 bands in the spectral region at 1.5 μm are presented. They account for the Fermi and l-type rotation and vibration resonances of the excited states. The frequency splittings between near resonant transitions, arising from a cancellation of effective rotational intervals with frequency shifts associated to the vibrational band origin, the anharmonicity and the rotation-vibration interactions, have sensitivity coefficients to a variation of μ of both signs in the range of 10–103. The measurements of temporal drifts of frequency splittings against the Cs frequency standard have the potential to better constrain a variation of μ comparing to that of other fundamental constants. The systematic frequency shifts for frequency splittings are discussed for experimental setups based on intracavity saturated absorption spectroscopy and the constraint of a measurement of a fractional variation of μ is projected at 10−10 level.

Mots clés: electron-to-proton mass ratio constant variation; spectroscopic constants; Fermi and l-type interactions; rovibrational spectroscopy; acetylene frequency standard

Domaines: Physique Quantique [quant-ph]; Optique [physics.optics]

Florin Lucian Constantin. Sensitivity to electron-to-proton mass ratio variation from 12 C2H2 rovibrational transitions to v 1 + v 3 and v 1 + v 2 + v 4 + v 5 interacting levels. Vibrational Spectroscopy, 2016, 85, pp.228-234. ⟨10.1016/j.vibspec.2016.04.012⟩. ⟨hal-03335700⟩