Infrared diode laser spectroscopy of the CCO radical: The 2ν1−ν1 and ν1+ν3−ν3 difference bands

Abstract

The 2ν1−ν1 and ν1+ν3−ν3 difference bands of the CCO radical in the gas phase have been studied 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 1920–1960 cm−1 was probed. Ninety and seventy-five rovibrational transitions were measured in the 2ν1−ν1 and ν1+ν3−ν3 bands, respectively. The analyses of these bands yielded spectroscopic constants for the (001), (200), and (101) vibrational states. The band origins for 2ν1−ν1 and ν1+ν3−ν3 were determined to be 1941.85761(54) cm−1 and 1936.79402(56) cm−1, respectively.