Following inner-valence ionization of a cluster, the system can relax by ul
trafast electron emission. In contrast to Anger decay this novel process is
intermolecular. It is characterized by an efficient Coulombic energy trans
fer mechanism between monomers in the cluster. As an example, we present an
analysis of the hydrogen fluoride trimer, based on extensive ab initio com
putations. (C) 2001 Elsevier Science B.dV. All rights reserved.