IMPURITY PHOTOIONIZATION THEORY OF PRECURSORS

Abstract

An extension of Wetzel's theory is proposed to explain electron precursor phenomena in pressure driven shock tubes. The theory is based on the assumption which has been experimentally verified, that radiation from the hot gas behind the shock front is responsible for the precursor effect. A point radiator, located at the shock front and moving with the shock velocity, is assumed. It is shown that this radiator can be idealized by a black body. The precursor electron density is derived from a one-step photoionization of the impurities present in the driven gas. As an application of the theory, precursor profiles are calculated for an H2 is varied from 2 to 75 microns Hg. The temperature behind the shock is assumed to be 11,000K.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1967
Accession Number
AD0663145

Entities

People

  • Daniel S. Wilson
  • Tony C. Lin

Organizations

  • New York University Tandon School of Engineering

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Absorption Coefficients
  • Absorption Cross Sections
  • Chemical Reactions
  • Coordinate Systems
  • Diffusion
  • Dissociation
  • Electron Density
  • Electrons
  • Emitters
  • Hot Gases
  • Ionization
  • Mach Number
  • Measurement
  • Mechanics
  • Partial Pressure
  • Photoionization
  • Radiative Transfer

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Plasma Physics.
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene