Articles you may be interested inThree-dimensional analytical infinite order sudden quantum theory for triatomic indirect photodissociation processes

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Ethylene (ethene, H 2 C=CH 2 ) is a naturally occurring compound in ambient air that affects atmospheric chemistry and global climate. The C 2 H 4 spectrum is available in databases only for the 1000 and 3000 cm −1 ranges.In this work, the ethylene absorption spectrum was measured in the 6030-6250 cm −1 range with the use of a high resolution Bruker IFS 125HR Fourierspectrometer and a two-channel opto-acoustic spectrometer with a diode laser. * To whom correspondence should be addressed. E-mail: Vincent.Boudon@u-bourgogne.fr. As a secondary standard of wavelengths, the methane absorption spectrum was used in both cases. A preliminary analysis was realized thanks to the tensorial formalism developed by the Dijon group that is implemented in the XTDS software package [Ch. Wenger, V. Boudon, M. Rotger, J.-P. Champion and M. Sanzharov, J. Mol. Spectrosc., 251, 102-113 (2008).]. We considered the two combination bands ν 5 + ν 9 and ν 5 + ν 11 as an interacting dyad. Parameters for the ν 9 /ν 11 dyad were fitted simultaneously from a re-analysis of previously recorded supersonic expansion jet FTIR data, while parameters for the v 5 = 1 Raman level were taken from literature. More than 600 lines could be assigned in the 6030-6250 cm −1 region (and also 682 in the 2950-3150 cm −1 region) and effective Hamiltonian parameters were fitted, including Coriolis interaction parameters. The dyad features are globally quite well reproduced, even if there are still problems at high J values.