Behavior of excess electrons in supercritical fluids -- Electron attachment

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The behavior of excess electrons in supercritical ethane was investigated by measuring mobility and reaction rates. Mobilities wee measured by means of a time-of-flight method at 306--320 K as a function of pressure. Mobility values decreased at all temperatures with increasing pressure, but showed a small minimum or a shoulder at the pressure where the compressibility {chi}{sub T} has a peak. Electron attachment to CO{sub 2}, NO, pyrimidine and C{sub 2}F{sub 4} over the same temperature range was studied as a function of pressure. Both attachment rate constants k{sub a} for NO and C{sub 2}F{sub 4}, and equilibrium constants K({double_bond}k{sub ... continued below

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4 pages

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Nishikawa, Masaru; Holroyd, R.A. & Itoh, Kengo July 1, 1999.

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  • Nishikawa, Masaru Kanagawa Inst. of Tech., Atsugi (Japan). Faculty of Engineering
  • Holroyd, R.A. Brookhaven National Lab., Upton, NY (US)
  • Itoh, Kengo Univ. of Tokyo (Japan). Dept. of Pure and Applied Sciences

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Description

The behavior of excess electrons in supercritical ethane was investigated by measuring mobility and reaction rates. Mobilities wee measured by means of a time-of-flight method at 306--320 K as a function of pressure. Mobility values decreased at all temperatures with increasing pressure, but showed a small minimum or a shoulder at the pressure where the compressibility {chi}{sub T} has a peak. Electron attachment to CO{sub 2}, NO, pyrimidine and C{sub 2}F{sub 4} over the same temperature range was studied as a function of pressure. Both attachment rate constants k{sub a} for NO and C{sub 2}F{sub 4}, and equilibrium constants K({double_bond}k{sub a}/k{sub d}) for CO{sub 2} and pyrimidine increased sharply at pressures of {chi}{sub T} peaks. Activation volumes V{sub a}* and reaction volumes {Delta}V{sub r} are very large and negative in the critical region. The volume change is mainly due to electrostriction around ions formed. The results are compared to volume changes predicted by a compressible continuum model.

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4 pages

Notes

OSTI as DE00354895

Source

  • Other Information: Supercedes report DE99003506; PBD: [1999]

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  • Other: DE99003506
  • Report No.: BNL--66560
  • Grant Number: AC02-98CH10886
  • DOI: 10.2172/354895 | External Link
  • Office of Scientific & Technical Information Report Number: 354895
  • Archival Resource Key: ark:/67531/metadc676653

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 1, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Aug. 4, 2016, 6:55 p.m.

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Nishikawa, Masaru; Holroyd, R.A. & Itoh, Kengo. Behavior of excess electrons in supercritical fluids -- Electron attachment, report, July 1, 1999; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc676653/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.