Abstract
The electronic orbital angular momentum effects in the A 1II u state of C3 have been considered. A very good fit to the observed vibronic energy levels and rotational constants has been obtained using a full matrix treatment of the orbital angular momentum in conjunction with a large amplitude formalism for the bending motion. The importance of the variation of the expectation value with bond angle is emphasized; the quality of the final fit is very much improved when this is included. Franck-Condon overlap integrals have been calculated for bands of the A 1II u -[Xtilde] 1Σ g + transition, which is the carrier of the 4050 A group of bands prominent in cometary spectra. A comparison has been made between the vibronic energy levels of linear and quasi-linear molecules in orbitally degenerate electronic states.
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