Excitation and Ionization Rates in Hydrogen at Very High E/n

  • G. N. Hays
  • L. C. Pitchford
  • J. B. Gerardo
  • J. T. Verdeyen
  • Y. M. Li
Conference paper

Abstract

We will report time-dependent electron density and excited state density measurements at very high E/n with a temporal resolution of 1 nsec. We create electron avalanching in gases of interest using a fast-rising (3–6 nsec) microwave (S-band) pu1se, while simultaneously monitoring the electrondensity with a low-power, S-band probe signal. This latter signal is in an interferometer configuration having sufficient sensitivity to monitor densities as low as ≅106 cm–3. The avalanche ionization takes place in a quartz cell contained in the S-band waveguide and having no electrodes or externally applied fields, except for a longitudinally applied magnetic field tuned to electron-cyclotron resonance at the high-power pulse frequency. The equivalent effective field under these conditions reduces to a DC field at one-half the peak value.

Keywords

Quartz Microwave 

Copyright information

© Springer-Verlag New York Inc. 1987

Authors and Affiliations

  • G. N. Hays
    • 1
  • L. C. Pitchford
    • 1
    • 2
  • J. B. Gerardo
    • 1
  • J. T. Verdeyen
    • 1
    • 3
  • Y. M. Li
    • 1
    • 2
  1. 1.Sandia National LaboratoriesAlbuquerqueUSA
  2. 2.GTE Laboratories, Inc.WalthamUSA
  3. 3.University of IllinoisChampaignUSA

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