A HIGH-RESOLUTION C-13 ISOTOPE STUDY IN THE VACUUM-ULTRAVIOLET OF SPECTRA OF CO(A-]X), C-I, AND C-II

The 4th positive bands of (CO)-C-13-O-16, A 1PI --> X 1SIGMA+, at wave lengths from 1370 to 1600 angstrom have been photographed at high reso lution in emission from a jet discharge in mixtures of Ar + (CO2)-C-13 . The A 1PI upper-state term values for low to medium J-values in v' = 0 to 9 have been established with an estimated accuracy of +/- 0.1 cm -1, and the percentage 1PI character of strongly perturbed levels in v ' = 0 and 6 has been evaluated. In addition, the C-13 isotope shifts h ave been measured for several multiplets in the spectra of C I and C I I.