10min:

JOHN A. COXON, Department of Chemistry, Dalhousie University, Halifax, Nova Scotia B3H 4J3, Canada; R. KEPA, A. KOCAN AND I. PIOTROWSKA-DOMAGALA, Atomic and Molecular Physics Laboratory, Institute of Physics, Univerity of Rzeszów, 35-310 Rzeszów, Poland.

Several A² X^{2 +} emission bands of CO⁺, for which the A-state vibrational level is perturbed, have been recorded photographically. The well known A( ' = 0)~\verb?~?~X( ^* = 10) and A( ' = 5)~\verb?~?~X( ^* = 14) perturbations between the A² and X^{2 +} states of ¹²C¹⁶O⁺, previously analysed by Coxon and Foster, have been reinvestigated by analysis of the 0 - 2 and 5 - 0 bands. The standard deviations of the least squares fits are typically about 0.02 cm^-1. Similarly, the A( '~=~1)~\verb?~?~X( ^* = 11) interaction in ¹³C¹⁶O⁺, first identified by Jakubek in an analysis of the 0 - 1 band of the B^{2 +} - A² system, has been studied by a deperturbation analysis of the rotational structure in the A² ( ' = 1) X^{2 +}( '' = 0) band. For ¹⁴C¹⁶O⁺, the corresponding A( ' = 2)~\verb?~?~X( ^* = 11) interaction has been observed for the first time by analysis of the 2 - 0 and 2 - 1 bands of the A - X system. The expected isotopic self-consistency of the interaction parameters and from individual bands of the three isotopomers is discussed.