An Appearance Potential Recorder

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A circuit has been developed that records the electron accelerating potential required to generate a barely detectable ion current at each mass in a mass spectrum. The level of electron accelerating potential attained for each ion peak approaches the true appearance potential for the instrument when the ion peak is one which would be large with 70 v electrons. The device is useful to select operating conditions for analyses at low electron accelerating potentials.

Document Type: Research Article


Affiliations: Chemical Physics Research Laboratory, The Dow Chemical Company, Midland, Michigan

Publication date: April 1, 1962

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