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2) FUNDAMENTAL BAND OF CIS -HOPO.
PAUL J. O'SULLIVAN, PETER A. HAMILTON AND PAUL B. DAVIES, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K..
The P=O (
2) stretching fundamental of the transient molecule cis -HOPO has been measured using high resolution infrared diode laser absorption spectroscopy. The molecule was formed in a flow system by reacting white phosphorus vapour and the products of a microwave discharge through a mixture of hydrogen and oxygen. Over 300 lines have been assigned between 1242cm-1 and 1267cm-1. The band has the structure of an a-type transition of an asymmetric rotor. Most of the assigned lines were included in a least squares fit using Watson's A -reduced Hamiltonian. The band origin is 1258.540021(12)cm-1. The rotational constants are in satisfactory agreement with those from Density Functional Theory and with those predicted from a comparison with the nitrogen analogue, cis -HONO:
TABLE
Many of the remaining, unfitted lines are perturbed, particularly around Ka=7. The source of the perturbation will be considered.