Study of resonance interactions in polyatomic molecules on the basis of highly accurate experimental data: Set of strongly interacting Bands ν₁₀(B₁), ν₇(B₂), ν₄(A₂), ν₈(B₂), ν₃(A₁)and ν₆(B₁) of CH₂=CD₂

The highly accurate (experimental accuracy in line positions ~(1-3)×10^-4cm^-1) FTIR ro-vibrational spectra of CH₂=CD₂in the region of 600-1300 cm^-1, where the fundamental bands ν₁₀, ν₇, ν₄, ν₈, ν₃, and ν₆are located, were recorded and analyzed with the Hamiltonian model which takes into account resonance interactions between all six studied bands. About 12 200 ro-vibrational transitions belonging to these bands (that is considerably more than it was made in the preceding studies for the bands ν₁₀, ν₇, ν₈, ν₃and ν₆; transitions belonging to the ν₄band were assigned for the first time) were assigned in the experimental spectra with the maximum values of quantum numbers Jmax./Kamax. equal to 31/20, 46/18, 33/11, 50/26, 44/20 and 42/21 for the bands ν₁₀, ν₇, ν₄, ν₈, ν₃, and ν₆, respectively. On that basis, a set of 133 vibrational, rotational, centrifugal distortion and resonance interaction parameters was obtained from the weighted fit. They reproduce values of 3920 initial "experimental" ro-vibrational energy levels (positions of about 12 200 experimentally recorded and assigned transitions) with the rms error d_rms=2.3×10^-4cm^-1.