Infrared laser spectroscopy of CCO: The v_1 band of the a~1#DELTA# electronic state

摘要

The rotationally resolved infrared spectrum of the v_1 band of the long-lived a-tilde~1#DELTA# electronic state of the CCO radical has been observed between 1918 and 1970 cm~(-1) using a tunable diode laser spectrometer. Metastable CCO was produced in a discharge through a flowing mixture of carbon suboxide and helium. Fifty eight rovibrational transitions in the P and R branches and the five lowest J lines in the Q branch were measured. The band origin was determined to be 1942.8515(19) cm~(-1). This is in close agreement to the values determined previously from photoelectron spectroscopy of CCO~-.