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Please note that the tag was initially incorrect.
The Z stereo isomer is the lower energy form;
the E form is calculated to be 3.563 kJ/mol
higher in energy.
Its rotational spectrum was recorded between
83 and 500 GHz by
(1) L. Bizzocchi, D. Prudenzano, V. M. Rivilla, A. Pietropolli-Charmet,
B. M. Giuliano, P. Caselli, J. Martín-Pintado,
I. Jiménez-Serra, S. Martín, M. A. Requena-Torres,
F. Rico-Villas, S. Zeng, and J.-C. Guillemin,
2020, Astron. Astrophys. 640, Art. No. A98.
The analysis takes into account lower frequency data
from
(2) M. Sugie, H. Takeo, and C. Matsumura,
1985, J. Mol. Spectrosc. 111, 83;
from
(3) D. McNaughton, O. I. Osman, and H. W. Kroto,
1985, J. Mol. Struct. 190, 195;
The parameter set differs slightly from the one in (1).
The calculations should be sufficiently accurate for all
observational purposes. Frequencies with calculated uncertainties
exceeding 0.2 MHz should be viewed with caution.
14N hyperfine splitting may be resolvable in could
sources at low quantum numbers. Therefore, a
separate hyperfine calculation is provided for
J ≤ 20 below 52 GHz.
NOTE: The
partition function does take into account
the spin multiplicity of the 14N
nucleus !
The two stereo isomeric forms were treated as separate
species in (1) which is certainly appropriate at low
temperatures. The partition function below refers to
the ground vibrational state only.
Vibrational correction factors for a posteriori corrections
were derived in (1) in the harmonic approximation.
It may be useful to treat the two forms as being in local
thermodynamic equilibrium at higher temperatures. Corresponding
vibrational correction factors with contributions for E for
a posteriori corrections of the rotational partition function of Z
were derived in the harmonic approximation.
The experimental dipole moment components are from (3).
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