The united-atom treatment has been applied to the systems PH2−, PH3, and PH4+. For PH3 and PH4+, satisfactory values are obtained for the total molecular energy and ``breathing'' force constants when compared with experiment. The model gives theoretical bond lengths which are in good agreement with the observed values. Coherent x-ray scattering factors are presented for PH3 and PH4+ along with a discussion of the molar diamagnetic susceptibilities. The value of the proton affinity derived here for PH3 is found to be in general agreement with the experimental results. Except for the considerable improvement in the proton-affinity calculation, the results obtained here are in keeping with the conclusions derived from our earlier work concerning the united-atom study of H2S.
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Banyard et al. (1965) studied this question.
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