Abstract
The absorption spectrum of the ν 2 fundamental band of the cis-conformer of the transient molecule HOPO, namely the terminal P O stretching mode, has been detected and measured using diode laser spectroscopy. The molecule was generated in a discharge flow system containing hydrogen and white phosphorus vapour (P 4) and a trace of oxygen. The spectrum has the appearance of an a-type band of a near prolate asymmetric top. Above K a = 5 the spectrum is perturbed and transitions terminating on these higher K a levels were excluded from the fit. The vibrational frequency and rotational constants derived from the unperturbed parts of the spectrum are compatible with new high precision ab initio calculations reported here. A combined fit of the ν 2 band and the ν 4 band data, measured earlier, was carried out. The ν 2 band origin was determined to be 1258.539525(32) cm −1, approximately 5.5 cm −1 higher than the matrix value.
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