NEW HIGH-RESOLUTION ANALYSIS OF THE NU(3)BAND, NU(4)BAND, AND NU(6)BAND OF D2CO MEASURED BY FOURIER-TRANSFORM-SPECTROSCOPY

A reanalysis of the v(3), v(4), and v(6) interacting bands of D2CO has been carried out in the region 850 - 1250 cm(-1) using high-resolutio n Fourier transform spectra recorded at Giessen. As compared to the pr evious study of these bands (1987, K. Nakagawa, R. H. Schwendeman, and J. W. C. Johns, J. Mol. Spectrosc. 122, 462 - 476) higher J and K-a t ransitions were assigned for the three bands, leading to a better dete rmination of the upper state constants. The v(3) = 1, v(4) = 1, and v( 6) = 1 experimental energy levels were introduced in a least-squares f it calculation together with the microwave measurements available in t he literature in order to obtain the upper state parameters (band cent ers, rotational and coupling constants). In this calculation, which al lowed us to reproduce both the infrared and the microwave measurements to within their experimental accuracies, the A-, B-, and C-type Corio lis interactions involving the rotational levels belonging to the v(4) = 1 and v(6) = 1, v(3) = 1 and v(4) = 1, and v(3) = 1 and v(6) = 1 in teracting states respectively were explicitly taken into account. Fina lly, from the intensities, a new determination of the relative values of the q(3), q(4), and q(6) first derivatives of the D2CO dipole momen t was performed. (C) 1998 Academic Press.