The vibrational Zeeman effect in HC ≡ CF and DC ≡ CF

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Abstract
The magnetic-field splittings of the J=1→2 l-type doublets of HCCF and DCCF, in their two bending modes, have been analysed to obtain information on the vibrationally induced moments. The vibrational g factors of the two isotopic species are g ‖ H v =0·4307(14) and g ‖ D v =0·2193(13), v=(00011 0), as well as g ‖ H v =0·0472(20) and g ‖ D v =0·0462(19), v=(000011). The signs are determined relative to that of the ground-state g factor, g ⊥ 0, which in turn is obtained from the isotopic effect. The values of g ⊥ v and ξ⊥ v -ξ‖ v are similar to those of the ground state. The nuclear contributions to the vibrational g factors were calculated via the normal coordinates, and a substantial electronic contribution was found.