The Submillimeter-Wave Rotational Spectra of 12CD 3F, 13CD 3F, CH 3Br, and CH 3CCH

Abstract

The ground state millimeter- and submillimeter-wave spectra of 12CD 3F, 13CD 3F, CH 3 79Br, CH 3 81Br, and CH 3C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 CH 3CCH in the vibrational states v 5( A 1) = 1 and v 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 | v 5 = 1; J, K = 3 or 4〉 and | v 10 = 3; l 10 = ±3, J, K = 3 or 4〉 is analyzed by a simple second-order perturbation treatment.