# FAR LINE WINGS STUDY OF THE $15 \mu m CO_{2}$ BAND: LABORATORY AND ATMOSPHERIC SPECTRA

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 Title: FAR LINE WINGS STUDY OF THE $15 \mu m CO_{2}$ BAND: LABORATORY AND ATMOSPHERIC SPECTRA Creators: Niro, C. F.; Hartmann, J.- M.; Boulet, C.; Hase, F. Issue Date: 2003 Publisher: Ohio State University Abstract: While a number of studies have been devoted to the analysis of the far wings of the $\nu_{3}$ band lines of $CO_{2}$ near $4 \mu m$ those of the $\nu_{2}$ band have never been investigated although precise modeling of absorption in the $10-15 \mu m$ region is essential due to its importance for atmospheric sounding. Starting from the successful results obtained in the modeling of Q branch line $mixing,^{a}$ the ECS (Energy Corrected Sudden) approach is extended in order to predict all line-mixing between P, Q, and R lines. The relaxation matrix is then constructed without use of any adjustable parameter for all $CO_{2}$ bands and with proper accounting of the coupling of angular momenta and of the symmetry of the vibrational transition. High pressure laboratory spectra have been recorded in the $600-1200 cm^{-1}$ region for temperature condition spanning the typical atmospheric range $(200-300 K)$. Comparisons with calculated values demonstrate the quality of the model which gives much better results than purely Lorentzian profiles. This result is confirmed when comparisons are made in the $4 \mu m$ region of the $\nu_{3}$ band wings. A compilation of first order coefficients derived from the relaxation matrix has then been used to compute atmospheric spectra. The comparison of calculated values with high-resolution ground based solar occultation spectra gives a further validation of our approach. Description: $^{a}$R. Rodriguez, K. W. Jucks, N. Lacome, Gh. Blanquet, J. Walrand, W. A. Traub, B. Khalil, R. Le Doucen, A. Valentin, C. Camy-Peyret, L. Bonamy, and J.-M. Hartmann, J. Quant. Spectrosc. Radiat. Transfer 61, 153-184 (1999). Author Institution: Laboratoire de Photophysique Mol\'{e}culaire, C.N.R.S., B\^{a}t. 350, Universit\'{e} Paris-Sud; Forschungszentrum Karlsruhe, Institut f\""{u}r Meteorologie und Klimaforschung (IMK) URI: http://hdl.handle.net/1811/20807 Other Identifiers: 2003-MG-08