Tunneling motions of argon on chlorofluoromethane.
The rotational supersonic jet Fourier transform microwave spectra of the 35Cl and 37Cl species of the molecular complex chlorofluoromethane-argon show that, in its equilibrium conformation, the argon atom is located out of the ClCF plane, interacting with the F and Cl atoms. All rotational transitions are split into several quadrupole components, each of them further split into two lines, due to the tunneling motion of the Ar atom between two equivalent positions, below and above the ClCF plane. The feasible low energy pathway between the structurally degenerate conformations is described, in a first approximation, by a circular motion around the C-Cl bond, with barriers estimated to be about 61 and 100 cm(-1).
Ottaviani
Paolo
P
Dipartimento di Chimica, G. Ciamician dell'Università, Via Selmi 2, I-40126 Bologna, Italy.
Caminati
Walther
W
Grabow
Jens-Uwe
JU