Microwave Spectra of Vinylacetylene and Monodeutero Vinylacetylene in Ground and Excited Vibrational States

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Abstract
The microwave spectra of vinylacetylene, CH2CHCCH, and monodeutero-vinylacetylene, CH2CHCCD, have been observed in the ground state and several vibrational excited states. The vibration-rotation constants α1(a), α1(b), α1(c), α2(a), α1(b), and α1(c), 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, −1640, −2.18 and −7.84 MHz for CH2CHCCD, respectively, the error limits being ±50 MHz for α(a)’s and ±0.03 MHz for α(b)’s and α(a)’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.