Abstract
Abstract We report here the experimental observation, by photoacoustic spectroscopy, of transitions to the (600 A1/E) local mode states of PH3. The vibrational energies for these two states are used, together with all other experimentally derived vibrational energies for PH3, as input for a least-squares refinement of the potential energy surface for the electronic ground state. We propose a procedure for simultaneously fitting the experimental data and ab initio values for the potential energy. By employing this procedure, we circumvent the problem of unrealistic behaviour of the fitted potential energy surface caused by the shortage of experimental data.
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