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A high pressure modulated molecular beam mass spectrometric sampling systemThe current state of understanding of free-jet high pressure sampling is critically reviewed and modifications of certain theoretical and empirical considerations are presented. A high pressure, free-jet expansion, modulated molecular beam, mass spectrometric sampling apparatus was constructed and this apparatus is described in detail. Experimental studies have demonstrated that the apparatus can be used to sample high temperature systems at pressures up to one atmosphere. Condensible high temperature gaseous species have been routinely sampled and the mass spectrometric detector has provided direct identification of sampled species. System sensitivity is better than one tenth of a part per million. Experimental results obtained with argon and nitrogen beams are presented and compared to theoretical predictions. These results and the respective comparison are taken to indicate acceptable performance of the sampling apparatus. Results are also given for two groups of experiments related to hot corrosion studies. The formation of gaseous sodium sulfate in doped methane-oxygen flames was characterized and the oxidative vaporization of metals was studied in an atmospheric pressure flowing gas system to which gaseous salt partial pressures were added.
Document ID
19770025298
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Stearns, C. A. (NASA Lewis Research Center Cleveland, OH, United States)
Kohl, F. J. (NASA Lewis Research Center Cleveland, OH, United States)
Fryburg, G. C. (NASA Lewis Research Center Cleveland, OH, United States)
Miller, R. A. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
July 1, 1977
Subject Category
Chemistry And Materials (General)
Report/Patent Number
NASA-TM-73720
E-9270
Accession Number
77N32242
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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