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1 BAND OF THE CoCO RADICAL PRODUCED BY THE ULTRAVIOLET PHOTOLYSIS OF Co(CO)3 NO..
TOSHIHIDE HIKIDA, SEIKI IKEDA, KEIICHI TANAKA AND TAKEHIKO TANAKA, Department of Chemistry, Faculty of Science, Kyushu University 33, Hakozaki, Higashiku, Fukuoka 812-8581, Japan.
Rovibrational transitions of the
1 band (C-O stretch) of the CoCO radical produced by the ultraviolet photolysis of Co(CO)3NO were observed in 1949-1991 cm-1 region by the time resolved infrared diode laser spectroscopy. The electronic ground state was confirmed to be X 2
i by the analysis as predicted by the density functional theory calculation. ~ More than 140 absorption lines were assigned to the
= 5/2 spin component of the
1 fundamental band in the X 2
i state. No lines of the
= 3/2 component were observed due to the large spin-orbit interaction constant A (-500 cm-1 ). Effective molecular constants for the
= 5/2 spin component, including the band origin
0 and the rotational constant B, were derived from observed transitions. Hot band lines originated from the
2 (Co-C-O bending) and
3 (Co-C stretch) vibrational excited states were observed. Absorption lines for the
2 hot band were split into two components because of the vibronic interaction between the
2 state and other nearby electronic excited states. The effective equilibrium rotational constant Be and the vibration rotation constants,
1,
2 and
3 were determined from the analysis of the fundamental band and hot bands.