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The experimental frequencies have been reported by
(1) K. M. T. Yamada and R. A. Creswell,
1986 J. Mol. Spectrosc. 116, 384; by
(2) L. Mbosei, A. Fayt, P. Dréan, and J. Cosléou,
2000, J. Mol. Struct. 517-518, 271; and by
(3) S. Thorwirth, H. S. P. Müller, and G. Winnewisser,
2000, J. Mol. Spectrosc. 204, 133.
In contrast to the first entry from Oct. 2000, the present
one is based on Pickett's SPCAT in an attempt to mimick the
Hamiltonian in (1) and (3); the one in (2) is very similar,
the main difference is the global fit employed there.
Mar. 2012: The
individual states have been set up differently to
describe the parity of the state
l = 2– correctly.
Now state number 0 refers
to l = 0+, state number 1
to l = 0–, and
state number 2 to l = 2.
Version number and date of entry have been retained.
Transition frequencies with uncertainties larger
than 50 kHz have not been merged.
As can be seen in (3), the Hamiltonian converges slowly.
This is probably caused by the rotational interaction
with v7 = 3. Predictions
beyond the measurements (> 815 GHz) should
thus be viewed with some caution.
Note: The partition
function does not include any vibrational
corrections. However,
vibrational contributions to the partition function
of HC3N are available.
The dipole moment was derived from the (0,0,0,0),
(0,0,0,1), and (0,0,1,0) states.)
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