ELECTRIC MULTIPOLAR INDUCTION IN THE FAR-INFRARED SPECTRA OF CO IN LIQUID AR - TRANSLATIONAL ROTATIONAL CONTRIBUTIONS AND STATIC CANCELLATION EFFECTS/

We have analyzed by means of molecular dynamics simulations the temper ature and density dependence of the different pure induced components of the far-infrared integrated absorption coefficient of CO in Liquid Ar (an interesting example for which experimental far-infrared spectra show the existence of high order electric multipolar induction). The main contribution to these components (for all the thermodynamic condi tions we elected) comes from the rotation of the diatomic except for d ipole induced-dipole absorption, where quantitatively rotation and tra nslation are similar. By studying static cancellation effects separate ly in rotation and translation, we can assert an interesting result: A ll those contributions to the integrated absorption coefficient with r adial decay equal or faster than the first repulsive decay of the solu te-solvent interaction present enhancement effects and all those decay ing slower present cancellation effects. (C) 1998 American Institute o f Physics.