Abstract
A LARGE range of substances which, because of their thermal instability or involatility, are unsuitable for admission in the gaseous state through a heated-inlet system into the ionization chamber of a mass spectrometer are usually studied by means of devices for volatilizing them very near the ionizing beam1–6. As a variant of the technique described by Bradt and Mohler5, a Metropolitan-Vickers M.S.3 tube has been modified for the study of the effects of heat on coal and coal extracts in the temperature range 60–450° C.
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