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Improvements and new capabilities for the multiple Knudsen cell device used in high‐temperature mass spectrometry
Author(s) -
Heyrman M.,
Chatillon C.,
Collas H.,
Chemin J.L.
Publication year - 2003
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1298
Subject(s) - chemistry , knudsen number , mass spectrometry , yield (engineering) , work (physics) , sampling (signal processing) , analytical chemistry (journal) , knudsen flow , process engineering , chromatography , mechanics , thermodynamics , computer science , physics , filter (signal processing) , engineering , computer vision
The thermodynamic properties of condensed phases, i.e. the activities of components, can be determined from partial pressures measured by the Knudsen cell mass spectrometric method. Improvements in accuracy and yield of this method are obtained with the use of twin cells, an idea proposed in the 1960s. The multiple cell method was perfected in 1977 in our laboratory. Changes to molecular beam sampling and furnace assemblies were required to make the multiple Knudsen cell technique work properly. This paper summarizes these prerequisites, and presents a new device and the associated method of measurements, as well as the necessary tests performed with a silver sample in each cell. Copyright © 2003 John Wiley & Sons, Ltd.