Two distinct OD isotopomers exist, which interact,
but no tunneling occurs. The aGg' conformer
is the one lowest in energy. State number 0 refers
to the ODOH variant (D is involved in a hydrogen bond
to the 2nd O atom and H is dangling), whereas state
number 1 refers to the OHOD variant, in which D and H
have exchanged their roles.
The experimental transition frequencies were summarized
by
(1) J. A. Claus, M. Melosso, A. Maillard, L. Bizzocchi,
V. Barone, and C. Puzzarini,
2025, ACS Earth Space Chem. 9, 1267.
A small number of microwave transitions was taken
from
(2) W. Caminati and G. Corbelli,
1981, J. Mol. Spectrosc. 90, 572.
The calculation was truncated at J = 60 and 600 GHz.
It should be sufficiently accurate for astronomical observations.
Great caution is advised for transitions with calculated
uncertainties exceeding 0.1 MHz.
The dipole moment components were assumed to agree
with those of the main isotopolog, see e062503.
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