Addendum to superfine and hyperfine structures in the ν3 band of 32SF6: Evidence for a tensor spin-vibration interaction in spherical tops

Abstract We give a first demonstration of a tensor spin-vibration interaction in the triply degenerate vibrationally excited state of a molecule. The corresponding coupling constant for 32 SF 6 has been found to be equal to −6.75 kHz from a theoretical fit of the hyperfine structures of P(4)F 1 and of the R(29)F 1 2 F 2 1 cluster in the ν 3 band around 10 μm. We also gave a more accurate value of the tensor spin-rotation coupling constant, c d , and the values of the reduced matrix elements of the relevant nuclear spin operators.