A Fourier transform interferometer was used to record the slit-jet cooled absorption spectrum of 12C2H4 between 700 and 2400 cm−1I, at a spectral resolution of 0.005 cm−1. Three bands, v12 at 1442.442 70(1)cm−1, v7 + v8 at 1888.978 23(3)cm−1 and v6 + v10 at 2047.775832(2)cm−1, were rotationally analysed. In the case of 7181, a known Coriolis perturbation mechanism involving the nearby 4181 (1958.264cm−1) and 81101 (1766.391 cm−1) states was accounted for in the analysis. The latter fitting procedure included 12 levels from the 4181 state which are observed because lines from v4 + v8 borrow intensity from v7 + v8. Compared to the literature, significantly improved vibration-rotation constants were obtained for all upper states reported in the present study.
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Hurtmans et al. (2001) studied this question.
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