The B̃2B1 ← X̃2A1 absorption system of NO2 in Xe matrices: evidence for Renner—Teller interaction

Abstract A tentative vibrational assignment of the B 2 B 1 ← X 2 A 1 absorption system of NO 2 in solid Xe is reported. About 65 bands were analysed, yielding normal vibration energies of ν 1 = 1230, ν 2 = 450 and ν 3 = 2040 cm −1 . The electronic transition energy can be estimated to be T 010 = 14160 cm −1 (14220 cm −1 for the gaseous phase). These observations are in good agreement with predictions made using ab initio calculations. Evidence for Renner—Teller interaction is documented by a systematic staggering of frequency intervals between successive bands in the ν 2 progression of the B state.