LABORATORI NAZIONALI DI LEGNARO
Based on a sophisticated class of mid-infrared laser sources in conjunction with the emerging technologies for the direct cooling of stable molecules, we envisage a new generation of low-energy, high-precision tests of the Standard Model. In particular, we report on the construction of an experiment which assesses the time constancy of the proton-to-electron mass ratio by means of an ultra-accurate spectroscopic frequency measurement on a molecular beam generated by a buffer-gas-cooling machine. For this purpose, a two-photon Ramsey-fringes interrogation scheme will be adopted, where the probe laser is phase-locked to a specially-developed optical frequency comb that is ultimately referenced to the cesium primary standard via the National Optical Fiber Link.

DATA: 10-12-2014