The experimental data were taken from
(1) L. R. Zink, D. A. Jennings, K. M. Evenson, and K. R. Leopold,
1990, Astrophys. J. 359, L65;
and from
(2) L. M. Ziurys, W. L. Barclay, Jr., and M. A. Anderson,
1993, Astrophys. J. 402, L21.
The dipole moment is from an ab initio calculation
by
(3) P. W. Fowler and A. J. Sedlej, 1991, Mol. Phys. 73, 43.
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