Abstract

Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan~Received 22 July 1999; published 15 February 2000!Both quantal and semiclassical mean-field theories based on the density-functional theory have recently beenapplied to describe the dynamical evolution of electrons during and after the collision between highly chargedions and metallic clusters. We here compare and assess both methods. The quantal calculation solves thetime-dependent Kohn-Sham equations, whereas the semiclassical one solves the Vlasov equation with the sameexchange-correlation functional. Predicted observables such as electron transfer and residual electronic exci-tations are in excellent agreement with each other. Ranges of applicability of both methods are discussed andcomplementarities are emphasized.PACS number~s!: 36.40.2cI. INTRODUCTION

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