Absolute totalhyphen;collision cross sections in the LAB energy range of 6ndash;1000 eV were measured for several alkalihyphen;metalndash;rarehyphen;gas systemsmdash;Nathinsp;plus;thinsp;Ar, Xe; Kthinsp;plus;thinsp;Ne, Ar, Kr, Xe; and Csthinsp;plus;thinsp;Kr, Xe. The limiting repulsive part of the intermolecular potential was described accurately by an inversehyphen;power lawCrminus;8, wheresvaried from 5.75 to 10.75 depending on the system. In the lowhyphen;energy region the cross sections for the heavier systems show a pronounced rise due to the influence of the attractive part of the potential. In no cases could the cross sections be fitted by a twohyphen;term Lennardhyphen;Jones potential. A more abrupt transition is required between the inversehyphen;power repulsion and the well region of the potential.
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