Ground state spectroscopic constants and electric dipole moment of D14N12C32S from its microwave and millimetre wave spectra

The microwave and millimetre wave spectra of D 14 N 12 C 32 S in its ground vibrational state have been investigated in the frequency region 8–210 GHz. A large number of a-type Q branch and b-type P and R branch transitions up to J = 62 have been assigned and measured for the first time. Their frequencies have been combined with those of the a-type R branches up to K = 5 in an analysis for rotational, centrifugal distortion, and 14 N quadrupole coupling constants. Constants obtained, in Watson's S reduction formalism, are: rotational constants in megahertz: A 0 = 705 511(370); B 0 = 5500.4391(15); C 0 = 5445.2252(15); quartic centrifugal distortion constants in kilohertz: D j = 1.0926(25); D jk = 1333.4(12); d 1 = 3.455(5) × 10 −2 d 2 = −7.8(14) × 10 −3 ; 14 N quadrupole coupling constants in megahertz: χ aa = 1.19(6), χ bb −χ cc <0.05. The b-component of the dipole moment, μ b , has been measured using the Stark effect as 1.08(15) D; this, when combined with μ a = 1.67(3) D gives a total dipole moment of 1.99(15) D, essentially parallel to the HN bond.