Infrared spectra of argon clusters
We calculate far infrared absorption spectra and permanent dipole moments for neutral argon clusters with up to 110 atoms. The model includes many-body dispersion, exchange quadrupoles and induction effects following the scheme proposed by Hutson and co-workers. The exchange quadrupoles are represented by dipoles pointing away from each other along the interatomic axes. We present predictions for future experiments and examine the dependence of our results on the parameters of the model. Calculated infrared absorption spectra and dipole moments show significant cluster size dependence, and experimental observation may be feasible with future improvements in sensitivity.
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