# Enhanced sensitivity to variation of $m {e}-m {p}$ in molecular spectra - Physics > Atomic Physics

Enhanced sensitivity to variation of $m {e}-m {p}$ in molecular spectra - Physics > Atomic Physics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We propose new experiments with high sensitivity to a possible spatial ortemporal variation of the electron-to-proton mass ratio $\mu \equiv m e-m p$.We consider a nearly-degenerate pair of molecular vibrational levels, whereeach state is associated with a different electronic potential. The change inthe splitting between such levels, with respect to a change in $\mu$, can belarge both on an absolute scale and relative to the splitting. We demonstratethe existence of such pairs of levels in Cs$2$. The narrow spectral linesachievable with ultracold Cs$2$ in these long-lived levels make this systempromising for future searches for small variations in $\mu$.

Author: D. DeMille, S. Sainis, J. Sage, T. Bergeman, S. Kotochigova, E. Tiesinga

Source: https://arxiv.org/