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The microwave spectrum was only studied astronomically.
The lines were published in
(1) M. Guélin, P. Friberg, and A. Mezaoui,
1982, Astron. Astrophys. 109, 23.
The laboratory data was take from
(2) C. A. Gottlieb, E. W. Gottlieb, P. Thaddeus, and H. Kawamura,
1983, Astrophys. J. 275, 916.
The v5 = 1 lowest vibrational state,
located at about 150 cm–1, see e050512.cat
has been considered for the calculation of the partition function.
The v = 0 and the v5 = 1
contributions are given in parentheses.
Since the vibrational energy of v5 = 1 is only
an estimate, these contributions should be viewed with some caution !
The dipole moment was taken from an ab initio
calculation in
(3) M. C. McCarthy, C. A. Gottlieb, P. Thaddeus, M. Horn, and P. Botschwina,
1995, J. Chem. Phys. 103, 7820.
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