title: Rotational spectrum and internal dynamics of tetrahydrofuran-krypton.
abstract: The rotational spectrum of the tetrahydrofuran-krypton van der Waals complex has been investigated by pulsed-jet Fourier transform microwave spectroscopy. The spectra of the (84)Kr and (86)Kr isotopologues have been assigned and the krypton atom is located nearly over the oxygen atom, almost perpendicular to the COC plane. Each rotational transition is split into two component lines due to, according to the observed Coriolis coupling term between the tunneling states, the residual pseudorotational effects of the ring in the complex. The splitting between the two vibrational sublevels is 87.462(2) and 87.062(2) MHz for the (84)Kr and (86)Kr isotopologues, respectively. These splittings have been used to determine the barrier to inversion, B(2) = 67 cm(-1). The dissociation energy has been estimated to be 3.7 kJ  mol(-1) from centrifugal distortion effects.
authors: Department of Chemistry, University of Bologna, Via Selmi 2, I-40126 Bologna, Italy.
authors: Qian
authors: Q
authors: Gou
authors: Gang
authors: G
authors: Feng
authors: Luca
authors: L
authors: Evangelisti
authors: Assimo
authors: A
authors: Maris
authors: Marianna
authors: M
authors: Marchini
authors: Biagio
authors: B
authors: Velino
authors: Walther
authors: W
authors: Caminati