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Higher-Sensitivity Ionization Trace-Species DetectorElectron source and electron optics of reversal electron-attachment detector modified to increase sensitivity. Original version described in "High-Sensitivity Ionization Trace-Species Detector" (NPO-17596). Used to detect molecules of particular chemical species of interest (e.g., narcotics, explosives, or organic wastes) present in air at low concentrations, and known to attach extremely low-energy electrons. Apparatus does this by ionizing molecules from sampled atmosphere, then detecting ions of species of interest. Detector features indirectly heated spherical cathode and redesigned electron optics, together, deliver more electrons at low kinetic energy to reversal plane, R. Greater electron current generates more ions for detection.
Document ID
19950065280
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Boumsellek, Said
(Caltech)
Chutjian, Ara
(Caltech)
Date Acquired
August 17, 2013
Publication Date
March 1, 1995
Publication Information
Publication: NASA Tech Briefs
Volume: 19
Issue: 3
ISSN: 0145-319X
Subject Category
Physical Sciences
Report/Patent Number
NPO-18870
Accession Number
95B10121
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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