Precise study of CHD{sub 3} spectrum in the region of 1900-2800 cm{sup -1}

High resolution spectrum of CHD{sub 3} (instrumental resolution 0.0035 cm{sup -1}) was recorded on the Bruker IFS 120HR Fourier transform spectrometer (Oulu) and analyzed in the region of 1900-2800 cm{sup -1}. Spectrum in this region contains two strong fundamental bands {nu}{sub 2}(A{sub 1}) and {nu}{sub 4}(E), and some weak combination and overtone bands 2{nu}{sub 3}(A{sub 1}), {nu}{sub 3} + {nu}{sub 6}(E), 2{nu}{sub 6}(A{sub 1}), 2{nu}{sub 6}(E), {nu}{sub 3} + {nu}{sub 5}(E), {nu}{sub 5} + {nu}{sub 6}(A{sub 1}), {nu}{sub 5} + {nu}{sub 6}(E), 2{nu}{sub 5}(A{sub 1}), and 2{nu}{sub 5}(E). There are only few detailed studies of spectrum in this region. However, even at the recent paper (d) parameters were not determined which would reproduce initial experimental data with satisfactory accuracies. The authors used for analysis a specially derived model of the Hamiltonian which is based on the irreducible tensorial sets theory. Taking into account: (a) higher-order resonance interactions between above mentioned vibration-rotation bands and (b) higher-order splitting parameters, the authors obtained a set of spectroscopic constants which reproduce initial experimental data with the accuracies near to experimental uncertainties. Anomalous behaviour of A{sub 1}-A{sub 2} splittings in E-type vibrational states and anomalous shifts of energy levels in A{sub 1}-type vibrational states aremore » discussed.« less