Q-branch line mixing effects in the (20(0)0)(I)<-01(1)0 and (12(2)0)(I)<-01(1)0 bands of carbon dioxide perturbed by N-2, O-2, and Ar and in the 13(1)0<-00(0)0 and 13(1)0<-01(1)0 bands of pure nitrous oxide

Line-mixing effects have been studied in two Q branches of the absorption spectra of CO2, in mixtures with nitrogen, oxygen, and argon. The corresponding transitions are (20(0)0)(I) <-- 01(1)0 and (12(2)O)(l) <-- 01(1)0, centered near 2130 cm(-1) and 2093 cm(-1), respectively. Line-mixing effects have also been examined in two Q-branches of pure N2O, corresponding to the 13(1)0 <-- 00(0)0 and 13(1)0 <-- 01(1)0 transitions, centered near 3046 cm(-1) and 2457 cm(-1), respectively. Good agreement is obtained between the experimental results and computations taking line mixing effects into account with a phenomenological model for the relaxation matrix. (C) 1996 Academic Press, Inc.