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The experimental transition frequencies
were published by
(1) B.-Z. Li and L. M. Ziurys,
1997, Astrophys. J. 488, L137.
The present parameters are very similar to the ones
reported there.
39K hyperfine splitting was not resolved;
it is probably negligible for observations of
late-type stars. Calculated transition frequencies
of the lower energy Π3/2 spin
component may be reliable throughout. Those in the
higher energy Π1/2 component should
be viewed with caution above 500 GHz,
especially for the higher frequency f
component.
The dipole moment was taken from an ab initio
calculation by
(3) H. S. P. Müller, 2018, unpublished.
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