Analysis of Methods for Determining Outgassing Rates
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Report Number: AEDC TDR 64-180
Author(s): Shipp, J. I., Trolinger, J. D.
Corporate Author(s): ARO, Inc.
Date of Publication: 1964-12
Pages: 21
Contract: AF 40(600)-1000
DoD Project: 6950
DoD Task: 695003
Identifier: AD0608660
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.
Provenance: IIT
Author(s): Shipp, J. I., Trolinger, J. D.
Corporate Author(s): ARO, Inc.
Date of Publication: 1964-12
Pages: 21
Contract: AF 40(600)-1000
DoD Project: 6950
DoD Task: 695003
Identifier: AD0608660
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.
Provenance: IIT