Abstract
Infrared diode laser kinetic spectroscopy was applied to the photodecomposition of the deuterated acetylene at 193 nm to observe the ν3 (C=C stretching) band of the CCD radical. The band origin which was derived from the observed spectrum is 1743.1785 (3) cm−1, in agreement with the result of a previous matrix study. As in the case of CCH, the spin–rotation interaction constant was found to change by as much as 31% upon ν3 excitation, presumably because of the interaction with the lowest excited electronic state. Many lines with lifetimes shorter than those of the ν3 band were observed, but remained to be assigned.
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