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Enhanced Sensitivity to Variation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>m</mml:mi><mml:mi>e</mml:mi></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mi>m</mml:mi><mml:mi>p</mml:mi></mml:msub></mml:math>in Molecular Spectra

Enhanced Sensitivity to Variation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>m</mml:mi><mml:mi>e</mml:mi></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mi>m</mml:mi><mml:mi>p</mml:mi></mml:msub></mml:math>in Molecular Spectra

We propose new experiments with high sensitivity to a possible variation of the electron-to-proton mass ratio $\ensuremath{\mu}\ensuremath{\equiv}{m}_{e}/{m}_{p}$. We consider a nearly degenerate pair of molecular vibrational levels, each associated with a different electronic potential. With respect to a change in $\ensuremath{\mu}$, the change in the splitting between such levels can …