INFRARED-SPECTRA OF ARGON CLUSTERS

We calculate far infrared absorption spectra and permanent dipole mome nts for neutral argon clusters with up to 110 atoms. The model include s many-body dispersion, exchange quadrupoles and induction effects fol lowing the scheme proposed by Hutson and co-workers. The exchange quad rupoles are represented by dipoles pointing away from each other along the interatomic axes. We present predictions for future experiments a nd examine the dependence of our results on the parameters of the mode l. Calculated infrared absorption spectra and dipole moments show sign ificant cluster size dependence, and experimental observation may be f easible with future improvements in sensitivity.