Rotational spectra of deuterated acetylenes: DCCH, D13CCH and DC13CH

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.