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Cooling efficiency in collisions between Pd 13 and He, Ne, Ar and Kr

Journal article
Authors J. Westergren
Sture Nordholm
Arne Rosen
Published in European Journal phys.
Volume 22
Issue 1
Pages 81-97
Publication year 2003
Published at Department of Chemistry
Pages 81-97
Language en
Keywords PACS. 34.10.+x General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.) - 34.30.+h Intramolecular energy transfer; intramolecular dynamics; dynamics of van der Waals molecules - 36.40.-c Atomic and molecular clusters
Subject categories Chemical Sciences


The cooling of the metal cluster Pd13 in an atmosphere of rare gas has been studied by means of computer simulation. By simulation, the average energy transfer in collisions between one cluster and one gas atom has been obtained. Emphasis has been placed on conditions when the temperatures of the colliding species are almost equal. All modes of motion, inclusive the translation, must be considered in order to obtain vanishing energy transfer at equilibrium. A simulation scheme is presented by which the energy transfer is zero to the cluster when the gas and the cluster temperatures are equal. At equilibrium the energy transfer does however not vanish for all impact parameters. In the collisions with Pd13, the cluster is heated by collisions with a small impact parameter but equally cooled by collisions with a large impact parameter. Argon and krypton are found to cool Pd13 equally efficiently while neon and helium are less efficient cooling agents.

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