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DOI 10.1063/1.1850897
Title Parallel temperatures in supersonic beams: Ultracooling of light atoms seeded in a heavier carrier gas
Creator/Author Miffre, A. ; Jacquey, M. ; Buechner, M. ; Trenec, G. ; Vigue, J. [Laboratoire Collisions Agregats Reactivite-IRSAMC, Universite Paul Sabatier and CNRS UMR 5589, 118, Route de Narbonne, 31062 Toulouse Cedex (France)]
Publication Date2005 Mar 01
OSTI IdentifierOSTI ID: 20662318
Other Number(s)Journal ID: ISSN 0021-9606; JCPSA6; TRN: US05A7307100869
Resource TypeJournal Article
Resource RelationJournal: Journal of Chemical Physics; Journal Volume: 122; Journal Issue: 9; Other Information: DOI: 10.1063/1.1850897; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Subject74 ATOMIC AND MOLECULAR PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ARGON; ATOM-ATOM COLLISIONS; ATOMIC BEAMS; COOLING; DILUTION; EXPANSION; LITHIUM; OXYGEN
Description/Abstract Supersonic expansion is a very powerful tool to produce an atomic beam with a well defined velocity and, by seeding a test gas in such an expansion, the energy of the test gas can be transferred, at least partially, to the very-low-temperature carrier gas. The case usually studied is the one of a heavy gas seeded in a light carrier gas and, in this case, the parallel temperature of the seeded gas is always larger than the one of the carrier gas. In the present paper, we study the opposite case which has received less attention: when a light gas is seeded in a heavier carrier gas, the parallel temperature can be substantially lower for the seeded gas than for the carrier gas. This effect has been first observed by Campargue and co-workers in 2000, in the case of atomic oxygen seeded in argon. In the present paper, we develop a theoretical analysis of this effect, in the high dilution limit, and we compare our theoretical results to several experimental observations, including a set of measurements we have made on a beam of lithium seeded in argon. The agreement between theory and experiments is good.
Country of PublicationUnited States
LanguageEnglish
FormatSize: page(s) 094308-094308.10
System Entry Date2006 Feb 16

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