MICROWAVE-SPECTRUM OF THE FURAN-CO VAN-DER-WAALS COMPLEX

The microwave spectrum of the furan-CO van der Waals complex has been measured between 6-19 GHz with a pulsed nozzle Fourier transform micro wave spectrometer, Due to a large amplitude motion of the CO subunit b etween two equivalent minima, the observed rotational transitions were split into two components. Their center frequencies were compatible w ith an asymmetric rotor with CO located above the plane of furan. The rotational spectrum has been analyzed using an effective model Hamilto nian that accounts for an internal rotation between furan and CO hinde red by a low barrier. (C) 1998 American Institute of Physics. [S0021-9 606(98)02810-4].