| Popis: |
The highly accurate (experimental accuracy in line positions ∼ ( 1 - 2 ) × 10 - 4 cm−1) ro-vibrational spectrum of the ν 8 + ν 10 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 cm−1 using the Hamiltonian model which takes into account Coriolis resonance interactions between the studied ν 8 + ν 10 band, which is forbidden in absorption, and the bands ν 4 + ν 8 and ν 7 + ν 8 . About 1570 transitions belonging to the ν 8 + ν 10 band were assigned in the experimental spectra with the maximum values of quantum numbers J max . = 35 and K a max . = 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 d rms = 0.00045 cm−1 ( d rms = 0.00028 cm−1 when upper ro-vibrational energies obtained from blended and very weak transitions were deleted from the fit). |
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