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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

Authors
Journal
Journal of Molecular Spectroscopy
0022-2852
Publisher
Elsevier
Volume
300
Identifiers
DOI: 10.1016/j.jms.2014.03.013
Keywords
  • Proton-To-Electron Mass Ratio
  • Buffer Gas Cooling
  • Two-Photon Ramsey Spectroscopy
Disciplines
  • Design
  • Physics

Abstract

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.

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