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Journal of Chemical Physics / Volume 127 / Issue 1 / ARTICLES / Condensed Phase Dynamics, Structure, and Thermodynamics: Spectroscopy, Reactions, and Relaxation

J. Chem. Phys. 127, 014504 (2007); http://dx.doi.org/10.1063/1.2746870 (5 pages)

Mobility of electrons in supercritical krypton: Role of density fluctuations

Masaru Nishikawa1, Richard A. Holroyd2, and Jack M. Preses2

1Faculty of Engineering, Kanagawa Institute of Technology, 1030 Shimo-Ogino, Astugi 243-0292, Japan
2Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973

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(Received 13 April 2007; accepted 11 May 2007; published online 3 July 2007)

Excess electrons were generated in supercritical krypton by means of pulsed x-ray irradiation, and the electron transport phenomena were studied. Electron signals immediately after a 30 ps pulse showed a distinctive feature characteristic of the presence of the Ramsauer-Townsend minimum in the momentum transfer cross section. The dependence of the drift velocity vD on field strength was found to be concave upward in the low field region and then to go through a maximum with increasing field strength, which is also typical of the presence of a minimum in the scattering cross section at an intermediate field strength. A minimum in the electron mobility was observed at about one-half the critical density. The acoustical phonon scattering model, which successfully explained the mobility change in this density region in supercritical xenon, was again found to account for the mobility in supercritical krypton.

© 2007 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENT
  3. RESULTS AND DISCUSSION
    1. Fast transients and hot electron effects
    2. Field-strength dependence of the drift velocity
    3. Electron mobility at low field

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KEYWORDS and PACS

Keywords

krypton, electron mobility, X-ray effects, phonons, conduction bands

PACS

  • 61.80.Cb

    X-ray effects

  • 71.20.-b

    Electron density of states and band structure of crystalline solids

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2746870

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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