2008年3月
Approach to thermal equilibrium in atomic collisions
PHYSICAL REVIEW LETTERS
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- 巻
- 100
- 号
- 10
- 開始ページ
- 103001
- 終了ページ
- -4
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevLett.100.103001
- 出版者・発行元
- AMER PHYSICAL SOC
The energy relaxation of fast atoms moving in a thermal bath gas is explored experimentally and theoretically. Two time scales characterize the equilibration, one a short time, in which the isotropic energy distribution profile relaxes to a Maxwellian shape at some intermediate effective temperature, and the second, a longer time in which the relaxation preserves a Maxwellian distribution and its effective temperature decreases continuously to the bath gas temperature. The formation and preservation of a Maxwellian distribution does not depend on the projectile to bath gas atom mass ratio. This two-stage behavior arises due to the dominance of small angle scattering and small energy transfer in the collisions of neutral particles. Measurements of the evolving Doppler profiles of emission from excited initially energetic nitrogen atoms traversing bath gases of helium and argon confirm the theoretical predictions.
- リンク情報
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- DOI
- https://doi.org/10.1103/PhysRevLett.100.103001
- J-GLOBAL
- https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200902214109681034
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000254024500018&DestApp=WOS_CPL
- ID情報
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- DOI : 10.1103/PhysRevLett.100.103001
- ISSN : 0031-9007
- J-Global ID : 200902214109681034
- Web of Science ID : WOS:000254024500018