The ground state rotational spectrum has been measured from 1 to 2600 GHz. These new measurements together with the older ones have been fitted to a standard A-reduced Watson-type Hamiltonian. The accuracy of the rotational and centrifugal distortion (including some octic ones) constants has been notably improved. The experimental constants are compared to the ab initio ones. (C) 1996 Academic Press. Inc.
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Watson J. K. G., 1977, Vibrational Spectra and Structure, P1