Infrared diode laser kinetic spectroscopy was applied to reaction intermediates generated by the photolysis of diacetylene and allene at 193 nm. A strong band was observed around 2040 cm−1 and was assigned to the ν3 band of C3 . The observed spectrum was analyzed by using an energy level expression for a linear molecule; higher-order centrifugal distortion terms were necessary to be included in the least-squares fit. The band origin was determined to be 2040.0198 (8) cm−1. The rotational and centrifugal distortion constants obtained suggest the presence of a potential barrier at the linear configuration in both the ground and ν3 states.
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Matsumura et al. (1988) studied this question.
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