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The 0-0 band of the d^1^+-b^1 electronic transition of SiC was detected near 6100 cm^-1. The SiC molecule was observed by high-resolution Fourier-transform emission spectroscopy from a composite-wall hollow cathode. Ab initio quantum chemical calculations confirm the identity of the carrier of the spectrum as SiC and the d^1^+-b^1 assignment. Combination of the observed r₀ for SiC b^1 with theoretical shifts in bond lengths from b^1 to X^3 gives the astrophysically important bond lengths r₀=1. 723 and r₄=1. 719 for X^3 to an estimated accuracy of 0. 001.
Bernath et al. (Mon,) studied this question.