Pure rotational were reported in
(1) G. Cazzoli, C. Puzzarini, L. Fusina, and F. Tamassia,
2008, J. Mol. Spectrosc. 247, 115.
The lowest energy transitions lie in unfavorable frequency
regions. Nevertheless, it is conceivable that this species
may be detected by radioastronomical means.
Predictions should be reliable up to at least 1.5 THz.
The dipole moment was derived from experiments described
in
(2) K. Matsumura, T. Tanaka, Y. Endo, S. Saito, and E. Hirota,
1980, J. Chem. Phys. 84, 1793.
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