Rotational spectra of deuterated acetylenes: DCCH, DCCH and DCCH

Rotational spectra of deuterated acetylenes, DCCH, D¹³CCH and DC¹³CH, have been recorded in the millimeter- and submillimeter-wave frequency ranges. In spite of the small dipole moment (0.01001(15) D), ¹³C-containing species have been observed in natural abundance. The present investigation allowed us to provide improved ground state rotational and quartic centrifugal distortion constants for DCCH, D¹³CCH and DC¹³CH. The experimental investigation has also been supported by ab initio calculations.