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Fluoronium, also known as protonated HF, is
isoelectronic to H2O.
The experimental lines are from
(1) R. Fujimori, K. Kawaguchi, and T. Amano,
2011, Astrophys. J. 729, L2;
and from
(2) T. Amano, F. Matsushima, T. Shiraishi, C. Shinozuka,
R. Fujimori, and K. Kawaguchi,
2012, J. Chem. Phys. 137, 134308.
Also used in the fit were infrared transitions
from
(3) S. Schä and R. J. Saykally,
1984, J. Chem. Phys. 81, 4189;
these were limited in Ka.
Predictions with uncertainties much larger than
1 MHz should be viewed with caution. However,
the predictions should be sufficiently accurate
for astronomical observations.
The ground state dipole moment is from an ab initio
calculation by
(4) P. R. Bunker, P. Jensen, J. S. Wright, and I. P. Hamilton,
1990, J. Mol. Spectrosc. 144, 310.
At low temperatures, it may be necessary to discern between
ortho-H2F+ and
para-H2F+.
The ortho and para states are described by
Ka + Kc being
odd and even, respectively. The nuclear spin-weights are
3 and 1 for ortho-H2F+ and
para-H2F+, respectively. The
JKaKc =
101 is the lowest ortho state. It is
21.9624 cm–1 above ground.
Separate
para and
ortho predictions are available up to
J = 5 and Ka = 3
along with separate
para and
ortho partition function values. Note:
the spin-weight of 3 for the separate ortho predictions
has been eliminated.
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