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The vacuum fusion method for the determination of gases in metals has found wide acceptance since its introduction, in this country, by Jordan and Eckman (4) in 1925. Also in specialized cases, gases are extracted at temperatures below the melting point. Every new area for use of these methods brings new problems of its own. The procedure is very simple in principle. The metal specimens are outgassed by melting—or, at a temperature below melting, by heating or electron bombardment—and the gases are then analyzed. Hydrogen may be passed through a hot palladium filter into a calibrated volume, or after oxidation to water vapor, may be absorbed by a solid absorbent or frozen out in a cold trap; following this, carbon dioxide may be removed by Ascarite or by freezing-out with liquid nitrogen. This is all done within the vacuum system. Alternatively, the collected gases may be transferred to a mass spectrometer and analyzed by that procedure; or they may be removed to a micro gas analyzer.
Guernsey, D. L.
Staff Member, Massachusetts Institute of Technology, Cambridge, Mass.
Franklin, R. H.
Putney Graduate School, Putney, Vt.