National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

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Analysis of Methods for Determining Outgassing Rates.

AD608660

Publication Date	1964
Personal Author	Shipp, J. I.; TTrolinger, J. D.
Page Count	2
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. (Author)
Keywords	DEGASIFICATION GAS FLOW VACUUM PUMPS MATERIALS MEASUREMENT FLOWMETERS PRESSURE GASES ADSORPTION ABSORPTION SUBLIMATION CONDUCTIVITY REVIEWS IONIZATION GAGES MASS SPECTROSCOPY SPECTRUM ANALYZERS VACUUM OUTGASSING DESORPTION
Corporate Authors	Arnold Engineering Development Center Arnold Air Force Station Tenn
Document Type	Technical Report
NTIS Issue Number	196501
Contract Number	AF40 600 1000

Analysis of Methods for Determining Outgassing Rates.

Analysis of Methods for Determining Outgassing Rates.
AD608660

Publication Date	1964
Personal Author	Shipp, J. I.; TTrolinger, J. D.
Page Count	2
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. (Author)
Keywords	DEGASIFICATION GAS FLOW VACUUM PUMPS MATERIALS MEASUREMENT FLOWMETERS PRESSURE GASES ADSORPTION ABSORPTION SUBLIMATION CONDUCTIVITY REVIEWS IONIZATION GAGES MASS SPECTROSCOPY SPECTRUM ANALYZERS VACUUM OUTGASSING DESORPTION
Corporate Authors	Arnold Engineering Development Center Arnold Air Force Station Tenn
Document Type	Technical Report
NTIS Issue Number	196501
Contract Number	AF40 600 1000