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M. BACH, R. GEORGES AND M. HERMAN, Laboratoire de Chimie Physique Mol\a'eculaire, CP160/09, Universit\a'e Libre de Bruxelles, B-1050, Belgium; A. PERRIN, Laboratoire de Photophysique Mol\a'eculaire, Batiment 210, Universit\a'e PARIS 11, Campus d'ORSAY, 91405 ORSAY CEDEX, FRANCE.
We have recorded the slit-jet cooled overtone absorption spectrum of ethylene between 3000 and 7000 cm-1, at a spectral resolution of 0.02 cm-1, using a Fourier transform interferometer. 11 bands are observed, some not reported before. They are all vibrationally identified and for the first time rotationally analysed. Anharmonic and Coriolis-type perturbations are considered. The vibrational energy pattern in ethylene is discussed.