A study of the Fourier transform far infrared spectrum of the C4 radical produced by trapping the products of the vacuum ultraviolet photolysis of 1,3-butadiene and acetylene in Ar at 10 K has resulted in the identification for the first time of a bending vibration at 172.4 cm−1. The assignment is confirmed by 13C isotopic data; is consistent with the earlier identification of the antisymmetric C=C stretching mode at 1543.4 cm−1; and is in agreement with the predictions of ab initio calculations for linear C4.
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Withey et al. (1991) studied this question.
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