EMISSION BANDS OF HO2 BETWEEN 1.43 AND 1.51 MU-M

The2A’→2A” electronic spectrum of HO2 at 1·43 µm has been recorded at high resolution with a S ISAM spectrometer. The analysis of the spectrum has yielded accurate molecular constants for the lowest vibrational level of the excited state. Emission is only observed from K’ <-2; possible explanations for this phenomenon are discussed. Forbidden ∆K= 0 transitions are observed; the principal mechanism for their existence is believed to be a Rennet-Teller interaction between the two electronic states. Vibrational hotbands of the type2A’ (v1v2v3)→2A”(v1v2v3) are observed. New spectroscopic information includes the three vibrational frequencies of the excited electronic state; the previous discrepancy in the value of v3 is explained. The O-H stretching overtone band2A”(200))→2A”(000) at 1·51 µm has also been recorded and analysed. © 1979 Taylor & Francis Group, LLC.