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The data were published in
(1) M. C. McCarthy, C. A. Gottlieb, P. Thaddeus, M. Horn, and P. Botschwina,
1995, J. Chem. Phys. 103, 7820;
and in
(2) M. C. McCarthy, G. W. Fuchs, J. Kucera, G. Winnewisser, and P. Thaddeus,
2003, J. Chem. Phys. 118, 3549.
Experimental transition frequencies with uncertainties larger
than 100 kHz have not been merged.
Vibrational contributions by the v5 = 1 state
can be estimated by taking twice the values from the
main isotopomer, see e050511.cat. The factor of two is due to the
additional hyperfine splitting caused by the 13C nucleus.
The ab initio dipole moment of the main isotopomer
was reported in (1).
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