Infrared laser spectroscopy of CCO radical in the region of the C–C stretching fundamental

Abstract

The C–C stretching fundamental ν3 and the difference band 2ν3−ν3 of the CCO radical have been measured in the gas phase using a tunable infrared diode laser spectrometer. The CCO radical was produced using a flowing mixture of carbon suboxide and helium subjected to a hollow-cathode discharge. The spectral region between 1035–1085 cm−1 was probed. Fifty-five and fifty-three rovibrational transitions were measured in the ν3 and 2ν3−ν3 bands, respectively. The analyses of these bands yielded spectroscopic constants for (001) and (002) vibrational states. The band origins for ν3 and 2ν3−ν3 were determined to be 1066.82407(54) and 1061.91084(63) cm−1, respectively. To check the consistency of the data in this work and those in the C–O stretching region, several lines from the ν1+ν3−ν1 band were also recorded. These lines were observed at their predicted frequency.