ANALYSIS OF METHODS FOR DETERMINING OUTGASSING RATES

Abstract

Methods of determining outgassing rates of materials under vacuum are discussed with emphasis on the accuracy and limitations of each. Pressure measurement techniques included are rate of evacuation, rate of rise, and a number of conductance methods. Assuming Langmuir's model for sticking probability, it is shown that these techniques can introduce large errors in determinations of desorption rates due to incorrect choice of pumping speed. Instrument calibration procedures and comparisons of results employing different techniques are also given.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1964
Accession Number
AD0608660

Entities

People

  • J. D. Trelinger
  • J. I. Shipp

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • C4I
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Adsorption
  • Air Force
  • Base Pressure
  • Body Weight
  • Chemical Reactions
  • Desorption
  • Diffusion Pumps
  • Electronic Circuits
  • Engineering
  • Flow
  • Ionization Gages
  • Mass Spectrometers
  • Measurement
  • Pressure Measurement
  • Sorption
  • Standards

Readers

  • Combustion and Flow Dynamics.
  • Regression Analysis.
  • Thin Film Deposition Science.