Stability of the proton-to-electron mass ratio

Details Stability of the proton-to-electron mass ratio Stability of the proton-to-electron mass ratio

2008-03-12

arxiv.org/abs/0803.1829v1

Phys.Rev.Lett.100:150801,2008

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevLett.100.150801

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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