The experimental data was reported by
(1) H. W. Kroto, J. F. Nixon, and K. Ohno,
1981, J. Mol. Spectrosc. 90, 512; by
(2) L. Bizzocchi, C. Degli Esposti, and P. Botschwina,
2000, Chem. Phys. Lett. 319, 411; and by
(3) L. Bizzocchi, S. Thorwirth, H. S. P. Müller, F. Lewen, and G. Winnewisser,
2001, J. Mol. Spectrosc. 205, 110.
The dipole moment has been measured in (1).
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