Z-2,3-dideuterooxirane is one of three dideuterooxirane isotopomers. The outdated name cis-2,3-dideuterooxirane can still be found occasionally. The transition frequencies were summarized in
(1) Z. Chen, S. Albert, K. Keppler, G. Wichmann, M. Quack, V. Schurig, and O. Trapp, 2026, Phys. Chem. Chem. Phys. 28, 751.
Most of the extensive measurements between 63 and 499 GHz are from this work. A small number of less accurate transition frequencies up to 61 GHz were taken from
(2) C. Hirose, 1974, Bull. Chem. Soc. Japan 47, 1311.
Five lines of this small list of lines were omitted because of their large residuals. The remaining data were retained in the fit only for completeness reasons. The calculation should be sufficient for all observational purposes. Calculated frequencies with uncertainties exceeding 0.1 MHz should be viewed with some caution.
There are no non-trivial spin-statistics in this molecule, in contrast to the main isotopolog.
The partition function takes into account the ground vibrational state only because the molecule resides in somewhat colder regions. Excited vibrational states are quite high; their effect is still modest at room temperature.
The dipole moment was derived here from that of the main isotopolog published by
(3) G. L. Cunningham Jr., A. W. Boyd, R. J. Myers, W. D. Gwinn, and W. I. Le Van, 1951, J. Chem. Phys. 19, 676 ;
with its value slightly increased by 0.02 D due to an updated reference value for OCS as outlined in
(4) H. S. P. Müller, J. C. Guillemin, F. Lewen, and S. Schlemmer, 2022, J. Mol. Spectrosc. 384, Art. No. 111584.