Millimeter- and Submillimeter-Wave Spectrum of Methylene Fluoride-d(2).

The millimeter- and submillimeter-wave spectrum of methylene fluoride-d(2) (CD(2)F(2)) has been observed in the region between 200 and 415 GHz. The spectrum was recorded using a frequency-modulated millimeter- and submillimeter-wave spectrometer. More than 400 rotational transitions up to J </= 60 and K(a) </= 21 in the ground state and more than 200 rotational transitions up to J </= 48 and K(a) </= 9 in the v(4) = 1 vibrational state have been assigned. The lines assigned are simultaneously least-squares fitted along with the microwave data in the Watson's A- and S-reduced Hamiltonian. Improved values have been obtained for the rotational constants and quartic centrifugal distortion constants, including for the first time, sextic distortion constants of the ground state as well as the v(4) = 1 state. Copyright 1999 Academic Press.