Enhanced effects of temporal variation of the fundamental constants in ~2II_(1/2)-term diatomic molecules: ~(207)pb~(19)F

摘要

The ~(207)Pb~(19)F molecule possesses a pair of closely spaced levels of opposite parity due to near cancellation of the omega-type doubling and magnetic hyperfine interaction energy shifts [Alphei et al., Phys. Rev. A 83, 040501 (2011)]. We calculate the dependence of the transition frequency between these levels on the fine-structure constant α and the ratio of the light quark masses to the quantum chromodynamics scale (m_q/Λ_(QCD)), and find large enhancement of the relative effects of the variation of these parameters. Note that the effect of α variation appears mainly due to the significant difference in the relativistic correction factors for the fine and hyperfine structure. We hence suggest the ~(207)pb~(19)F molecule as a candidate system for investigating the possible temporal variation of the fundamental constants.