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NEW ANALYSIS OF THE $\nu_3$ BAND OF HDCO (MONODEUTERATED FORMALDEHYDE) IN THE 5.8 $\mu$m REGION

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/38233

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Title: NEW ANALYSIS OF THE $\nu_3$ BAND OF HDCO (MONODEUTERATED FORMALDEHYDE) IN THE 5.8 $\mu$m REGION
Creators: Gomez, L.; Perrin, A.; Mellau, G. C.
Issue Date: 2009
Abstract: omment{ } Using high-resolution Fourier transform spectra of mono deuterated formaldehyde (HDCO) recorded in the 5.8~$\mu$m spectral range at Giessen (Germany), we carried out an extensive analysis of the strong $\nu_3$ 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 $\nu_3$ lines which are due to the existence of the 2$\nu_5$ (at 2059~cm$^{-1}$) and $\nu_5$+$\nu_6$ (at 2087~cm$^{-1}$) dark bands $), the CHD rocking (at 1028~cm$^{-1}$) and the CHD out of plane (at 1059~cm$^{-1}$) modes, respectively}. In addition a local resonance is perturbing the 3$^1$ levels which is due to a crossing with the 4$^1$ energy levels. However the 4$^1$ state is also involved in strong vibration-rotation interactions coupling the $\{$5$^1$,6$^1$,4$^1$$\}$ system of resonating states of HDCO . Therefore the final energy levels calculation which was performed for the $\{$5$^1$,6$^1$,4$^1$,3$^1$,5$^2$,5$^1$6$^1$$\}$ 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 $\nu_3$ band intensity available in the literature we generated, for the first time, a list of line parameters (positions and intensities) for the 5.8~$\mu$m band of HDCO.
URI: http://hdl.handle.net/1811/38233
Other Identifiers: 2009-RI-07
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