Abstract
Free jet expansion sampling mass spectrometry is a valuable tool for identifying high temperature vapor species formed in a 1 bar process. The system at NASA Glenn consists of four differentially pumped vacuum chambers. A Pt/20Rh entrance nozzle from the 1 bar process to a rapidly pumped chamber creates the free jet expansion. This is followed by a skimmer and thus an intense supersonic molecular beam is formed and directed to a quadrupole mass spectrometer. An unobstructed path to the mass spectrometer allows direct identification of condensable and non-condensable vapor species formed at 1 bar while preserving their chemical and dynamic integrity.This system has been very valuable for identification of metal hydroxides and oxyhydroxides which would not have been seen in a low pressure system. We discuss studies of Si(OH)4, Al(OH)3, TaO(OH)3, B(OH)3, and CrO2(OH)2 vapors.
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