Abstract
Abstract Newly observed data on the rotational constants of carbon su☐ide in excited vibrational states of the low-wavenumber bending vibration ν 7 have been successfully interpreted in terms of the two-dimensional anharmonic oscillator wavefunctions associated with this vibration. By combining these results with published infrared and Raman spectra the vibrational assignment has been extended and a refined bending potential for ν 7 has been derived: this has a minimum at a bending angle of about 24° at the central C atom, with an energy maximum at the linear configuration some 23 cm −1 above the minimum. From similar data on the combination and hot bands of ν 7 with ν 4 (1587 cm −1 ) and ν 2 (786 cm −1 ) the effective ν 7 bending potential has also been determined in the one-quantum excited states of ν 4 and ν 2 . The effective ν 7 potential shows significant changes from the ground vibrational state; the central hump in the ν 7 potential surface is increased to about 50 cm −1 in the v 4 = 1 state, and decreased to about 1 cm −1 in the v 2 = 1 state. In the light of these results vibrational assignments are suggested for most of the observed bands in the infrared and Raman spectra of C 3 O 2 .
Published Version
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