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Assessing the time constancy of the proton-to-electron mass ratio by precision ro-vibrational spectroscopy of a cold molecular beam

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Santambrogio,  Gabriele
Molecular Physics, Fritz Haber Institute, Max Planck Society;
CNR-INO, Istituto Nazionale di Ottica;

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Citation

Santamaria, L., Sarno, V. D., Ricciardi, I., Mosca, S., Rosa, M. D., Santambrogio, G., et al. (2014). Assessing the time constancy of the proton-to-electron mass ratio by precision ro-vibrational spectroscopy of a cold molecular beam. Journal of Molecular Spectroscopy, 300, 116-123. doi:10.1016/j.jms.2014.03.013.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0018-A3E5-5
Abstract
We report the design of an experiment that aims to constrain, over a-few-year timescale, the fractional temporal variation of the proton-to-electron mass ratio, β=mp/me, at a level of 10-15/yr by means of a spectroscopic frequency measurement on a beam of cold CF3H molecules. This is extracted from a buffer-gas-cooling source and then collimated by means of an electrostatic hexapole lens. Employed in a two-photon Ramsey-fringes interrogation scheme, the probe source is based on a mid-infrared quantum cascade laser, phase-locked to a specially-developed optical frequency comb that is ultimately referenced to the Cs primary standard via an optical fiber link.