Electrons and positrons in dense gases

  • Khrapak A
  • Yakubov I
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The appearance of electrons or positrons in dense gaseous media produces a whole series of striking
phenomena governed by the properties of the states of the light particles in the dense medium. The
present review considers these phenomena systematically. The results of measurements of electron
mobility and positron annihilation rates in moderately dense gases are discussed. Effects that arise
as the density of the gas increases are considered. Self-trapped states become possible at high
densities: these are bound states of the light particles with the medium, "clusters," "bubbles," or
mixed-type formations. The fluctuon theory of these states is set forth, along with the results of
experiments in which the light particles make transitions to new states. The possible existence of
"orientation clusters" in gases consisting of polar molecules is investigated. Certain applications
of the results to the theory of discharges in dense gases and liquids and to the theory of the
weakly ionized nonideal plasma are discussed.

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  • Aleksei G Khrapak

  • I T Yakubov

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