Enhanced sensitivity to variation of the fine structure constant and m_p/m_e in diatomic molecules

Abstract

Sensitivity to temporal variation of the fundamental constants may be strongly enhanced in transitions between narrow close levels of different nature. This enhancement may be realized in a large number of molecules due to cancelation between the ground state fine structure omega_f and vibrational interval omega_v (omega=omega_f - n omega_v is close to zero, delta omega/omega= K (2 delta alpha/alpha +0.5 delta mu/mu), K >>1, mu=m_p/m_e). The intervals between the levels are conveniently located in microwave frequency range and the level widths are very small. Required accuracy of the shift measurements is about 0.01-1 Hz. As examples, we consider molecules Cl_2+, CuS, IrC, SiBr and HfF+.

v.3: references added + few other minor changes

References in corpus (5)

• Enhanced effect of temporal variation of the fine structure constant in diatomic molecules
• Enhanced sensitivity to time-variation of m_p/m_e in the inversion spectrum of ammonia
• Candidate molecular ions for an electron electric dipole moment experiment
• Limit on the Temporal Variation of the Fine-Structure Constant Using Atomic Dysprosium
• A new measure of Delta alpha/alpha at redshift z = 1.84 from very high resolution spectra of Q1101-264

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