Vibrational Renner-Teller effects in the infrared spectrum of carbon suboxide

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Abstract
The infrared spectrum of carbon suboxide has been recorded with a resolution of 0·01cm-1 from 400 to 700 cm-1. The region from 530 to 570 cm-1 shows intense absorption due to the v 6(Π u ) band system, of which the fundamental band only has been assigned and analysed, giving v 6=540·221 cm-1. The region 590 to 660 cm-1 shows weaker absorption due to the v 5(Π g ) band system appearing in combination with odd quanta of the v 7(Π u ) fundamental at 18 cm-1. The v 5 + v 7 band and several hot bands have been assigned and analysed, and the effective v 7 bending potential in the v 5 state has been deduced. This potential shows a splitting as the large amplitude bending coordinate q 7 is displaced due to interaction between v 5 and v 7 analogous to the Renner-Teller effect in electronic spectroscopy. This splitting is about 4 cm-1 for the classical turning points in q 7 and the mean q 7 bending potential is closely similar to that in the ground state.

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