The rotational spectrum of the ethanol···argon van der Waals complex has been investigated by free-jet absorption millimeter-wave and molecular beams Fourier transform microwave spectroscopy. The spectra of normal and OD isotopomers have been assigned, but only for the complex with trans-ethanol. Ar motions produce vibrational splittings of 1.6662(7) and 1.70(2) MHz for the two isotopic species, respectively. The barrier hindering the tunnelling motion has been evaluated to be about 55 cm-1. The van der Waals structural parameters are: r0(Ar-O)=3.56(1) Å, α0 (∠ArOC) = 94°(1) and τ0 (∠ArOCC)=71°(1). The dissociation energy, as obtained from centrifugal distortion effects, is 2.1 kJ mol-1
Free and pulsed jet rotational spectra and van der Waals motions of ethanol•••argon
MARIS, ASSIMO;CAMINATI, WALTHER;VELINO, BIAGIO;
2004
Abstract
The rotational spectrum of the ethanol···argon van der Waals complex has been investigated by free-jet absorption millimeter-wave and molecular beams Fourier transform microwave spectroscopy. The spectra of normal and OD isotopomers have been assigned, but only for the complex with trans-ethanol. Ar motions produce vibrational splittings of 1.6662(7) and 1.70(2) MHz for the two isotopic species, respectively. The barrier hindering the tunnelling motion has been evaluated to be about 55 cm-1. The van der Waals structural parameters are: r0(Ar-O)=3.56(1) Å, α0 (∠ArOC) = 94°(1) and τ0 (∠ArOCC)=71°(1). The dissociation energy, as obtained from centrifugal distortion effects, is 2.1 kJ mol-1I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
