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Experimental results were reported by
(1) M. P. Bucchino, P. M. Sheridan, J. P. Young,
M. K. L. Binns, D. W. Ewing, and L. M. Ziurys,
2013, J. Chem. Phys. 139, Art. No. 214307.
The 39K hyperfine split a-type
transition frequencies from that work were
also included in the fit.
39K HFS splitting may be resolvable at
low values of J and higher values of
Ka, but these transitions are
deemed to be too weak even if the molecule
will have been observed in space. The entry
may be sufficiently accurate for all observational
purposes. Transitions with predicted uncertainties
exceeding 0.2 MHz should be viewed with some caution.
The dipole moment was taken from an ab initio
calculation by
(2) H. S. P. Müller, 2018, unpublished.
Even though the molecule posseses a moderately large
b-dipole moment component, no such transitions were
calculated because their frequencies are too uncertain.
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