Cooling efficiency in collisions between Pd and He,Ne, Ar and Kr |
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| Authors: | J Westergren S Nordholm A Rosén |
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| Institution: | 1.School of Physics and Engineering Physics, Department of Experimental Physics, Chalmers University of Technology and G?teborg University, 412 96 G?teborg, Sweden,SE;2.Department of Chemistry, G?teborg University, 412 96 G?teborg, Sweden,SE |
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| Abstract: | 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.
Received 28 September 2001 / Received in final form 8 August 2002 Published online 12 November 2002
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ID="a"e-mail: JanW@phc.gu.se |
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| 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 |
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