DeMille D, Sainis S, Sage J, Bergeman T, Kotochigova S, Tiesinga E
Department of Physics, Yale University, New Haven, Connecticut 06520, USA.
Phys Rev Lett. 2008 Feb 1;100(4):043202. doi: 10.1103/PhysRevLett.100.043202. Epub 2008 Jan 29.
We propose new experiments with high sensitivity to a possible variation of the electron-to-proton mass ratio mu identical with 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 mu, the change in the splitting between such levels can be large both on an absolute scale and relative to the splitting. We demonstrate the existence of such pairs of states in Cs2, where the narrow spectral lines achievable with ultracold molecules make the system promising for future searches for small variations in mu.
我们提出了对电子与质子质量比μ（μ = m(e)/m(p)）可能变化具有高灵敏度的新实验。我们考虑一对近乎简并的分子振动能级，每个能级都与不同的电子势相关。相对于μ的变化，此类能级之间分裂的变化在绝对尺度上以及相对于分裂而言都可能很大。我们证明了在Cs2中存在这样的能级对，其中超冷分子可实现的窄光谱线使该系统有望用于未来对μ的微小变化的搜索。
