Analysis of the 1-υ" progression of the 3A band system (c3Π-a3Π) in the 13C16O molecule spectrum

The 1-0, 1-1, and 1-2 bands of the 3A system of (CO)-C-13 (c(3)Pi -a(3)Pi) have been recorded for the first time, in the form of discharge emission spectra photographed at high resolution. Preliminary rotational analysis suggests that the upsilon = 1 level of the c(3)Pi state is perturbed in a fashion similar to the upsilon = 0 level, previously observed by Dabrowski et al. (1987. I. Dabrowski, M. Vervolet, and D. C. Wang, Can. J. Phys. 65, 1171-1177). Rotational combination differences from the 1720 measured lines have been used to obtain rotational constants for the upsilon = 0-2 levels of the a(3)Pi state, using the Hamiltonian of Brown et nl. (1979. J. Mi Brown, E. A. Carbourn, J. K. G. Watson, and F. D. Wayne, J. Mel. Spectrosc. 74, 294-318). and the least squares formalism of Curl and Dane (1988. J. Mel. Spectrosc. 128, 406-412), as modified by Watson (1989. J. Mol. Spectrosc. 138, 302-308). Term values for the c(3)Pi, upsilon = 1 level have then been obtained from the line frequencies, and a set of effective rotational constants for the c(3)Pi (upsilon = I) level of (CO)-C-13 has been derived, (C) 2000 Academic Press.