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Rotational transition frequencies were taken
from
(1) D. Gupta, W. G. D. P. Silva, J. L. Doménech,
E. Plaar, S. Thorwirth, S. Schlemmer, and O. Asvany,
2023, Faraday Discuss. 245, 298.
The calculations were truncated at J = 25 and at
500 GHz. The calculations should be viewed with
caution if the uncertainties exceed 0.2 MHz.
The rotational partition function is converged employing
summation over states with J up to 99.
Spin-statistics (3 : 1) were considered; ortho
states have Ka odd and para
states have Ka even.
The dipole moment is from a quantum-chemical calculation
by
(2) X. Huang and T. J. Lee,
2011, Astrophys. J. 736, Art. No. 33.
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