The present entry considers a large set of millimeter and submillimeter data, such that it differs considerably from the previous ones from Jan. 2019 and Feb. 2006, in particular at higher frequencies or quantum numbers. The (sub-) millimeter data were reported by
(1) N. Inostroza-Pino, V. Lattanzi, C. Z. Palmer, R. C. Fortenberry, D. Mardones, P. Caselli, O. E. Godwin, and T. J. Lee, 2024, Mol. Phys., Art. No. e2280762.
Several microwave transitions have been reported by
(2) A. P. Cox, S. D. Hubbard, and H. Kato, 1982, J. Mol. Spectrosc. 93, 196.
Two additional lines were retained from astronomical observations in
(3) N. Marcelino, J. Cernicharo, E. Roueff, M. Gerin, and R. Mauersberger, 2005, Astrophys. J. 620, 308.
The parameters are essentially the same as in (1); exceptions are an estimate of H_K from the previous entry and H_J, which was kept fixed to a value from a quantum chemical calculation in (1).
Calculations should be sufficient for all observational purposes. Frequencies with ΔK_a = 2 or with calculated uncertainties exceeding 0.2 MHz should be vied with caution.
The dipole moment was measured in (2).
At low temperatures, it may be necessary to discern between ortho-D₂CS and para-D₂CS. The ortho states are described by K_a even, the para states by K_a odd. The nuclear spin-weights are 2 and 1 for ortho-H₂CS and para-H₂CS, respectively. The J_KaKc = 1₁₁ is the lowest para state. It is 5.3333 cm^–1 above ground.