Intensity measurements and collision-broadening coefficients for the oxygen A band measured by intracavity laser absorption spectroscopy

High-sensitivity, high-resolution intracavity laser absorption spectroscopy (ICLAS) has been used to measure line intensities, nitrogen-broadening coe fficients, and self-broadening coefficients in the A band (b(1)Sigma(g)(+) <-- X(3)Sigma(g)(-)) of oxygen. Both linear cavity and ring cavity ICLAS co nfigurations were used for these measurements, and the results were interco mpared. The results were compared to values measured using long-path multip le-reflection cells by K. D. Ritter and T. D. Wilkinson [J. Mol. Spectrosc. 121, 1-19 (1987)] and L. Brown and C. Plymate, [J. Mol. Spectrosc. 199, 16 6-179 (2000)]. New results are included for weal;ly absorbing transitions, not observed in the earlier measurements, such as high rotational states (u p to J = 39), hot-band transitions (nu' = 1 <-- nu " = 1), and isotopically substituted species (O-18(2) and (OO)-O-16-O-18). Isotopic variants (O-16( 2), O-18(2) and (OO)-O-16-O-18) have similar broadening coefficients for co rresponding rotational levels, but the self-broadening coefficients art: la rger in the hot band (nu' = nu " = 1) as compared with nu' = nu " = 0 trans itions. An ECS-EP scaling analysis of the nu' = nu " = 0 self-broadening da ta accurately represents the available data, with the exception of the N = 0 and N = 1 levels. (C) 2000 Academic Press.