Microwave spectra of vinylacetylene and monodeutero vinylacetylene in ground and excited vibrational states

The microwave spectra of vinylacetylene, CH 2CHCCH, and monodeutero-vinylacetylene, CH2CCCD, have been observed in the ground state and several vibrational excited states. The vibration-rotation constants alpha((a))(1) , alpha((b))(1), alpha((c))(1), alpha((a))(2), alpha((b))(2), and alpha((c))(2), have been obtained as 1 370, -18.32, -7.73, -907, -2.78, and -8.97 MHz for CH2CHCCH, and 2 010, -16.66, -7.05, - 1 640, - 2.18 and - 7.84 MHz for CH2CHCCD, respectively, the error limits being 50 MHz for alpha((a)) 's and +/- 0.03 MHz for alpha((b)) 's and alpha((c))'s. Electric dipole moments obtained are 0.223 +/- 0.020 and 0.206 +/- 0.008 Debye for CH2CHCCH and CH2CHCCD, respectively, which are quite different from the values reported previously.