Rotational analysis of the 2ν5 Band of Formaldehyde
Résumé
The spectrum of the 2ν5 C-H stretching band of formaldehyde has been measured by Barry et al [Phys. Chem. Chem. Phys., 4, 445 (2002).] with FTIR spectroscopy. We have rotationally analysed this spectrum with the help of PGOPHER, a general purpose program for simulating and fitting rotational spectra. The spectrum shows several perturbations and there is sufficient information available on the vibrational structure from a dispersed fluorescence spectra study by Bowens et al [J. Chem. Phys. 104, 460 (1996)] and theoretical calculations by Burleigh et al [J. Chem. Phys. 104, 480 (1996)] to allow us to identify the perturbing states and deperturb the energy levels. The resulting perturbation parameters and rotational constants enabled us to reproduce the experimental line positions with an average error of 0.013 cm-1. We also present a list of line positions and relative intensities in the region around 1.76 μm.
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