Physics – Atomic Physics
Scientific paper
2008-03-12
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.
Amy-Klein Anne
Butcher Robert James
Chardonnet Christian
Shelkovnikov Alexander
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