Electron 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.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Higher-Sensitivity Ionization Trace-Species Detector


    Contributors:

    Published in:

    Publication date :

    1995-03-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English





    High-Sensitivity Ionization Trace-Species Detector

    Bernius, Mark T. / Chutjian, Ara | NTRS | 1990



    Modulated-Voltage Metastable-Ionization Detector

    Carle, Glenn C. / Kojiro, Daniel R. / Humphry, Donald E. | NTRS | 1988


    Improving Trace-Ion Sensitivity

    Buggle, R. N. | NTRS | 1984