Enhanced sensitivity to variation of $m_{e}/m_{p}$ in molecular spectra

Details Enhanced sensitivity to variation of $m_{e}/m_{p}$ in molecular spectra Enhanced sensitivity to variation of $m_{e}/m_{p}$ in molecular spectra

2007-09-06

arxiv.org/abs/0709.0963v1

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevLett.100.043202

We propose new experiments with high sensitivity to a possible spatial or temporal variation of the electron-to-proton mass ratio $\mu \equiv m_e/m_p$. We consider a nearly-degenerate pair of molecular vibrational levels, where each state is associated with a different electronic potential. The change in the splitting between such levels, with respect to a change in $\mu$, can be large both on an absolute scale and relative to the splitting. We demonstrate the existence of such pairs of levels in Cs$_2$. The narrow spectral lines achievable with ultracold Cs$_2$ in these long-lived levels make this system promising for future searches for small variations in $\mu$.

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