Infrared diode laser spectroscopy of the CCO radical: the 2v1-v1 and v1+v3-v3 difference bands

Abstract

The 2n 12n 1 and n 11n 32n 3 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 cm21 was probed. Ninety and seventy-five rovibrational transitions were measured in the 2n 12n 1 and n 11n 32n 3 bands, respectively. The analyses of these bands yielded spectroscopic constants for the ~001!, ~200!, and ~101! vibrational states. The band origins for 2n 12n 1 and n 11n 32n 3 were determined to be 1941.85761(54) cm21 and 1936.79402(56) cm21, respectively.