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The initial experimental data were taken from
(1) J. K. Tyler, 1964, J. Chem. Phys. 40, 1170;
from
(2) J. W. C. Johns, J. M. R. Stone, and G. Winnewisser,
1971, J. Mol. Spectrosc. 38, 437;
from
(3) P. Dréan, J. Demaison, L. Poteau, and J.-M. Denis,
1996, J. Mol. Spectrosc. 176, 139;
and from
(4) L. Bizzocchi, S. Thorwirth, H. S. P. Müller, F. Lewen,
and G. Winnewisser,
2001, J. Mol. Spectrosc. 205, 110.
With respect to the Feb. 2000 entry, improved low-frequency transition
frequencies (≤ 160 GHz) were included in the fit.
They were reported by
(5) L. Bizzocchi, C. Degli Esposti, L. Dore, and C. Puzzarini,
2005, Chem. Phys. Lett. 408, 13.
Transitions with uncertainties ≥ 100 kHz have
not been merged.
Predictions above 2 THz should be viewed with caution.
The partition function takes into account
v2 = 0 and 1. Numbers in parentheses
refer to the ground vibrational state.
The experimental dipole moment was reported in (1).
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