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  • PHYSICAL SCIENCES  (2)
  • 2000-2004
  • 1995-1999  (2)
  • 1985-1989
  • 1998
  • 1995  (2)
  • 1
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    Higher-Sensitivity Ionization Trace-Species Detector (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: 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.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-18870 , NASA Tech Briefs (ISSN 0145-319X); 19; 3; P. 59
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Measuring Traces Of Oxygen By Resonant Electron Attachment (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Method of detecting trace amounts of oxygen based on dissociative attachment of electrons to oxygen molecules followed by measurement of resulting flux of negative oxygen ions in mass spectrometer. High sensitivity achieved in method by exploiting resonance in dissociative attachment of electrons to oxygen molecules: electron-attachment cross section rises to high peak at incident electron kinetic energy of 6.2 eV. Relative concentrations below 1 ppb detected. Devised to increase sensitivity of detection of oxygen in processing chambers in which oxygen regarded as contaminant; for example, chambers used in making semiconductor devices and in growing high-purity crystals.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-19098 , NASA Tech Briefs (ISSN 0145-319X); 19; 11; P. 14a
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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