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Enhanced effects of temporal variation of the fundamental constants in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mn>2</mml:mn></mml:msup><mml:msub><mml:mi>Π</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>-term diatomic molecules:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>207</mml:mn></mml:msup></mml:…
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 …