Oscillator Strengths and Predissociation Widths for Rydberg Transitions in Carbon Monoxide (original) (raw)
CO is used as a probe of astronomical environments ranging from planetary atmospheres and comets to interstellar clouds and the envelopes surrounding stars near the end of their lives. One of the processes controlling the CO abundance and the ratio of its isotopomers is photodissociation. Accurate oscillator strengths for Rydberg transitions are needed for modeling this process. We present results of recent analyses on absorption from the E-X (1-0), B-X (6-0), K-X (0-0), L'-X (1-0), L-X (0-0), and W-X (nu'-0, nu' = 0 to 3) bands acquired at the high resolution (R ≈ 30,000) SU5 beam line at the Super-ACO Synchrotron (Orsay, France). Spectra were obtained for the ^{12}C^{16}O, ^{13}C^{16}O, and ^{13}C^{18}O isotopomers. Absorption bands were analyzed by synthesizing the profiles with codes developed independently in Meudon and Toledo. Each synthetic spectrum was adjusted to match the experimental one in a non-linear least-squares fitting procedure with the band oscil...