Title screen

[References: p. 13 (52 tit.)]

The highly accurate (experimental accuracy in line positions ð1 2Þ 104 cm1 ) ro-vibrational spectrum of the m8 þ m10 band of the 12C2H4 molecule was recorded for the first time with high resolution Fourier transform spectrometry and analyzed in the region of 1650-1950 cm1 using the Hamiltonian model which takes into account Coriolis resonance interactions between the studied m8 þ m10 band, which is forbidden in absorption, and the bands m4 þ m8 and m7 þ m8. About 1570 transitions belonging to the m8 þ m10 band were assigned in the experimental spectra with the maximum values of quantum numbers J max: ¼ 35 and Kmax: a ¼ 18. On that basis, a set of 38 vibrational, rotational, centrifugal distortion, and resonance interaction parameters was obtained from the fit. They reproduce values of 598 initial ''experimental'' ro-vibrational energy levels (positions of about 1570 experimentally recorded and assigned transitions) with the rms error drms ¼ 0:00045 cm1 (drms ¼ 0:00028 cm1 when upper ro-vibrational energies obtained from blended and very weak transitions were deleted from the fit).