High-resolution study of the (v(1)+1/2v(2)+v(3)=3) polyad of strongly interacting vibrational bands of D2O

Analysis of the high-resolution Fourier transform spectra of the D2O first decade was can-led out in the framework of the Hamiltonian model which took Into account resonance interactions between the seven states, (300), (201) , (102), (003), (220), (121), and (022). Assigned from the experimentally r ecorded spectrum transitions belonged to the four bands, 2 upsilon (1) + up silon (3), 3 upsilon (3), upsilon (1) + 2 upsilon (2) + upsilon (3), and 3 upsilon (1), gave the possibility both of obtaining rotational, centrifugal distortion, and resonance interaction parameters of "appeared" states, (20 1), (003), (121), and (300), and of estimating from the fit band centers, r otational, and resonance interaction parameters of the three "dark" states, (220), (022), and (102). (C) 2000 Academic Press.