Stark effects in the rotational spectrum of the dimer H2O⋅⋅⋅HF and the variation of the electric dipole moment with excitation of the low-frequency, hydrogen-bond modes

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Abstract
The Stark effects in the J=2←1 rotational transitions of the nearly prolate asymmetric rotor H2O⋅⋅⋅HF have been analyzed in the vibrational ground state and in each of the states (1, 0, 0), (0, 1, 0), (0, 0, 1), and (1, 1, 0). The nonmenclature (vβ(o), vβ(i), vσ) refers to the vibrational quantum numbers associated with the out‐of‐plane bending mode vβ(o), the in‐plane bending mode vβ(i) and the stretching mode vσ, respectively, which are the three lowest energy modes of the hydrogen bonded dimer. The electric dipole moment μ for each of these states determined via the Stark effect is as follows: