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3 BAND OF HDCO (MONODEUTERATED FORMALDEHYDE) IN THE 5.8~µm REGION.
L. GOMEZ, LAboratoire de Dynamique, Interactions et Réactivité (LADIR, CNRS UMR 7075) Université Pierre et Marie Curie - Paris VI ; Case courrier 49, Bât F 74, 4, place Jussieu, 75252 Paris Cedex, France.; A. PERRIN, Laboratoire Inter Universitaire des Systemes Atmosphériques, CNRS, Université Paris 12, 61 Av du General de Gaulle, 94010 Créteil Cedex France; G. C. MELLAU, Justus-Liebig - Universität, Physikalisch-Chemisches Institut, Heinrich-Buff-Ring 58, D-35392 Gieß en, Germany.
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Using high-resolution Fourier transform spectra of mono deuterated formaldehyde (HDCO) recorded in the 5.8~µm spectral range at Giessen (Germany), we carried out an extensive analysis of the strong
3 fundamental band (carbonyl stretching mode) at 1724.2676~cm-1, starting from results of a previous analysis . For this hybrid band (with both A- and B-type transitions) the analysis was pursued up to high rotational quantum numbers. In this way, it was possible to evidence resonances which perturb the
3 lines which are due to the existence of the 2
5 (at 2059~cm-1) and
5+
6 (at 2087~cm-1) dark bands \footnote[2]
4,
5 and
6 correspond to the CHD bending (at 1396~cm-1), the CHD rocking (at 1028~cm-1) and the CHD out of plane (at 1059~cm-1) modes, respectively. In addition a local resonance is perturbing the 31 levels which is due to a crossing with the 41 energy levels. However the 41 state is also involved in strong vibration-rotation interactions coupling the $151,61,41$1 system of resonating states of HDCO \footnote[3]A. Perrin, J. M. Flaud, L. Margulès, J. Demaison, H. Mäder and S. Wörmke, J. Mol. Spectrosc. 216, 214 (2002). Therefore the final energy levels calculation which was performed for the $151,61,41,31,52,5161$1 resonating states accounts for the observed A- type, B- type C-type Coriolis (and/or) Fermi resonances. In this way it was possible to reproduce the observed line positions, within their experimental uncertainties. Finally using a
3 band intensity available in the literature we generated, for the first time, a list of line parameters (positions and intensities) for the 5.8~µm band of HDCO.