THE SUBMILLIMETER-WAVE ROTATIONAL SPECTRA OF (CD3F)-C-12, (CD3F)-C-13, CH3BR, AND CH3C-CH

The ground state millimeter- and submillimeter-wave spectra of (CD3F)-C-12, (CD3F)-C-13, (CH3Br)-Br-79, (CH3Br)-Br-81, and CH3C=CH have been observed and accurate rotational and centrifugal distortion constants have been derived from their analysis. The possibility of resolving the A(1)-A(2) Splitting of the K = 3 lines is discussed. The rotational spectra of CH3C=CH in the vibrational states upsilon(5)(A(1)) = 1 and upsilon(10)(E) = 1 have been measured. For the latter state, lines up to 1050 GHz (J = 60) were measured. These new data have been used to improve the accuracy of the rotational, centrifugal distortion, and vibration-rotation interaction constants. A local anharmonic interaction between the states / upsilon(5) = 1; J, K = 3 or 4] and / upsilon(10) = 3; l(10) = +/- 3, J, K = 3 or 4] is analyzed by a simple second-order perturbation treatment. (C) 1994 Academic Press, Inc.