Sensitivity of vibrational spectroscopy of optically trapped SrLi and CaLi molecules to variations in m_p/m_e

摘要

Precision measurements of the X~2Σ(v, N) = (0, 0) → (vu, 0) (vu = 1, 2, 3, 4) transition frequencies from optically trapped ~(88)Sr~6Li and ~(40)Ca~6Li molecules are proposed, with the intention to test the variation in the proton-to-electron mass ratio m_(p/m)e. The Stark shifts induced by the trap and Raman lasers are eliminated by choosing appropriate frequencies (magic frequencies). These transitions are measurable with an uncertainty lower than 10-16 and can be used to test the variation in mp/me, as already shown with ~(174)Yb~6Li molecular transitions.