HIGH-RESOLUTION INFRARED-SPECTRUM OF THE NU-1 BAND OF OCLO

The infrared absorption spectrum of the ν1 band of OClO (care must be taken to distinguish it from ClOO, which also exists) has been recorded in the 950 cm-1 region, with a Fourier transform infrared spectrometer with an instrumental resolution of ∼0.004 cm-1. Most lines appear as doublets owing to the spin-rotation interaction present in this molecule. Around 2800 lines have been assigned for the 35ClO2 species and ∼800 for the 37ClO2 species. In addition, a number of lines of the "hot band", ν1 + ν2 - ν2, have been assigned for the 35ClO2 species. Effective rotational and spin-rotational spectroscopic constants have been obtained for the ground and the v1 = 1 vibrational states of 35ClO2 and 37ClO2 and the corresponding band origins have also been determined. Fermi resonance between the 2ν2 and ν1 bands has been found to be negligible; however, a weak resonance between the Ka = 7 levels of v1 = 1 and the Ka = 9 levels of v2 = 2 has been observed. The measured integrated ν1 band strength is 87 ± 6 cm-2 atm-1 at 300 K. © 1991.