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Thomas Pohl

Electron-temperature evolution in expanding ultracold neutral plasmas

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  • P Gupta
  • ,
  • S. Laha
  • ,
  • C. E. Simien
  • ,
  • H. Gao
  • ,
  • J. A. Castro
  • ,
  • T. C. Killian
  • ,
  • T. Pohl

We have used the free expansion of ultracold neutral plasmas as a time-resolved probe of electron temperature. A combination of experimental measurements of the ion expansion velocity and numerical simulations characterize the crossover from an elastic-collision regime at low initial Gamma(e), which is dominated by adiabatic cooling of the electrons, to the regime of high Gamma(e) in which inelastic processes drastically heat the electrons. We identify the time scales and relative contributions of various processes, and we experimentally show the importance of radiative decay and disorder-induced electron heating for the first time in ultracold neutral plasmas.

Original languageEnglish
Article number075005
JournalPhysical Review Letters
Volume99
Issue7
Number of pages4
ISSN0031-9007
DOIs
Publication statusPublished - 17 Aug 2007

    Research areas

  • 3-BODY RECOMBINATION, EXPANSION, VACUUM, BUNCH

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