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Theoretical study of CH3Cl-N2 line shapes in the ν1 band. Line mixing effects in QR doublets and QQk sub-branches

Ma, Qiancheng; Boulet, Christian

Line coupling and line mixing effects of CH3Cl lines in the v1 band perturbed by N2 have been investigated. We have taken into account the non-diagonality of the exp(-S2) operator within specified line spaces as well as the k-degeneracy of the transitions (due to the double degeneracy of the j,k levels with k does not equal to 0). These transitions should be considered as doublets coupled by the line mixing process. A new problem appears in the calculation when the atom-atom potential model is introduced. In order to overcome this difficulty, a pragmatic approach is proposed. Comparisons of theoretically calculated matrix elements of W with measurements of QR(j,k) doublets as well as some QQk sub-branches, which are strongly affected by line mixing, have been made. The results show that the formalism improved in this way leads to rather accurate predictions.


Also Published In

Journal of Quantitative Spectroscopy and Radiative Transfer

More About This Work

Academic Units
Applied Physics and Applied Mathematics
Published Here
August 6, 2021