S. Douin et P. Brechignac, ANALYSIS OF VAN-DER-WAALS VIBRATIONS IN SMALL (N=1 TO 4) AROMATIC-(RARE GAS)(N) CLUSTERS, Journal de chimie physique et de physico-chimie biologique, 92(2), 1995, pp. 283-309
A set of new, or improved, experimental R2P2CI spectra of the various
structural isomers of aniline-(argon)(n) clusters with n = 1 to 4 have
been obtained in the region of the S-1-S-0 origin band. They exhibit
a very large number of sharp VdW excited bands. A simplified mechanica
l model has been developped to describe the solvent to chromophore mot
ions in the different isomers. From this restricted harmonic descripti
on of the force field, force constants and reduced masses were derived
from fitting the spectra of the simple (1\0), (1\1),(2\0), (3\0) clus
ters, which allowed to make predictions for the VdW frequencies of the
more complex (2\1) and (3\1) clusters and thus to propose assignments
for the experimentally observed bands.