title: The Millimeter-Wave Spectrum of 2,3-Dihydrofuran
abstract: The millimeter-wave spectrum of 2,3-dihydrofuran in the ground and five ring-puckering excited states has been measured in the frequency range 100-250 GHz. The ground and first ring-puckering excited states have been fitted to a two-state Hamiltonian including Coriolis coupling interaction. The determined energy difference of 18.684(7) cm-1 between these states and the a and b type coupling parameters are consistent with the ring-puckering potential function and the previously observed dependence of the centrifugal distortion constants DeltaJK, DeltaK, and deltaK. A small ring-puckering dependence of the quartic centrifugal distortion constants DeltaJ and deltaJ has been also observed. This dependence is well accounted for in terms of the ring-puckering potential function and the vibrational dependence of the rotational constants.
authors.affiliation: Laboratoire de Spectroscopie Hertzienne, Universite de Lille I, Villeneuve d'Ascq, F-59655, France
authors.initials: JC
authors.lastname: Lopez
authors.initials: G
authors.lastname: Wlodarczak
authors.initials: J
authors.lastname: Demaison