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Transitions without hyperfine structure have been
reported by
(1) J. Xin and L. M. Ziurys,
1999, Chem. Phys. Lett. 310, 411.
39K hyperfine splitting was resolved
in measurements by
(2) P. M. Sheridan, M. K. L. Binns, M. Sun, J. Min, M. P.
Bucchino, D. T. Halfen, L. M. Ziurys,
2011, J. Mol. Spectrosc. 269, 231.
The stated uncertainties in (1, 2) appear to be too
conservative; smaller values have been employed here.
Predictions may be reliable up to about 550 GHz.
A separate prediction with
39K hyperfine splitting is available for
J" ≤ 5. Note:
The partition function does not include the
spin-multiplicities of 39K ! Therefore,
partition function values have to be multiplied by 4
when considering 39K hyperfine splitting !
The dipole moment is from an ab initio calculation
by
(3) H. S. P. Müller, 2011, unpublished.
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