Anomalous Behavior of Water Vapor in Mass Spectrometry

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概要

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• It is well known that the rate of effusion of particles in gaseous or vapor phase appears inversely proportional to the mass of the particles under the condition where the effusive flow can be undertaken. The effusive behavior, therefore, may be utilised for the explanation of mass spectra attributing a peak of certain mass number to be originated from the particle of known molecular weight. The authors studied the effusive behavior of water vapor comparing with some standard gaseous and vapor phase samples such as Ar, CO<SUB>2</SUB>, C<SUB>2</SUB>H<SUB>5</SUB>OH, using a mass spectrometer specially arranged to be available for the present purpose, and found that water vapor statically evaporated should behave as it is consisted of the double molecule of H<SUB>2</SUB>O in the process of flow through the so-called " gas leak " hole. This conclusion is supported by the discrepancy between the mass spectrometrically measured ionization potential and the spectroscopic data.

• 日本質量分析学会の論文

著者

• 門田 憲章

  京都大学工学部燃料化学教室

• 石田 精一

  株式会社柳本製作所

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