Stability of the proton-to-electron mass ratio
Résumé
We report a limit on the fractional temporal variation of the proton-to-electron mass ratio as , obtained by comparing the frequency of a rovibrational transition in SF6 with the fundamental hyperfine transition in Cs. The SF6 transition was accessed using a CO2 laser to interrogate spatial 2-photon Ramsey fringes. The atomic transition was accessed using a primary standard controlled with a Cs fountain. This result is direct and model-free.
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