THE 3[-0 CH STRETCH OVERTONE OF BENZENE

The second CH stretch overtone of benzene has been studied both experi mentally and theoretically. A recent high-resolution opto-thermal expe riment showed that the overtone spectrum consists of several absorptio n bands located in the region between 8730 and 8875 cm-1. In this work , we investigate possible contributions of strong hot bands to the abs orption around 8770 cm-1. Our results show that this region of the opt o-thermal spectrum is not significantly affected by hot bands. The spe ctrum has been described by a theoretical calculation based on the alg ebraic theory. We find good agreement with experimental results. The l ow-frequency region and minor satellite peaks are reproduced reasonabl y well. Quantum labels are assigned to some of the observed peaks.