Abstract
The spectrum of the 050 Σu−3–010 Σg−3 band of the b̃ 3Πg–ã 3Πu electronic transition of C3 is reported. The data, when considered with the previously observed 010 Σu−3–010 Σg−3 band, measure the absolute interval between the 050 Σu−3 and 010 Σu−3 levels of the b̃ 3Πg state. This interval, and the Renner parameters for ã 3Πu and b̃ 3Πg [D. W. Tokaryk and S. Civiš, J. Chem. Phys. 103, 3928 (1995)], allow us to greatly improve estimates of the bending vibrational wave numbers in these electronic states. The values (542.3 cm−1 for ã 3Πu, and 392.4 cm−1 for b̃ 3Πg) predict the origins of all previously reported bands of b̃ 3Πg –ã 3Πu involving bending to within 13 cm−1.
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