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Analysis of Methods for Determining Outgassing Rates

Report Number: AEDC TDR 64-180
Author(s): J. I. Shipp and J. D. Trolinger
Corporate Author: ARO, Inc.
Date of Publication: 1964-12
Pages: 21
Contract: AF 40(600)-1000
Project: 6950
Task: 695003
AD Number: AD0608660

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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