The laboratory transition frequencies were reported
by
(1) H. Habara and S. Yamamoto,
2000, J. Chem. Phys. 112, 10905.
The present parameter set differs slightly from the one
in (1). The calculated spectrum should be sufficient for
all observational purposes. Caution is advised for
frequencies with calculated uncertainties exceeding
0.1 MHz. Some caution is also suggested for transitions
with relatively large HFS splitting as the parameters were
scaled from those of the parent species.
The dipole moment was assumed to agree with that of
the main species, which should be sufficiently close.
Its total dipole moment is from a quantum-chemical
calculation by
(2) C. Ochsenfeld, R. I. Kaiser, Y. T. Lee, and M. Head-Gordon,
1999, J. Chem. Phys. 110, 9982;
the a and b components were derived in (1)
from relative intensity measurements. The uncertainties are
probably several percent. We note that no b-type
transitions were calculated as none were observed in the
laboratory, such that there positions are too uncertain.
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