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  • Other Sources  (6)
  • 1
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    Parametrization of electron impact ionization cross sections for CO, CO2, NH3 and SO2 (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The electron impact ionization and dissociative ionization cross section data of CO, CO2, CH4, NH3, and SO2, measured in the laboratory, were parameterized utilizing an empirical formula based on the Born approximation. For this purpose an chi squared minimization technique was employed which provided an excellent fit to the experimental data.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-180913 , JPL-PUB-87-2 , NAS 1.26:180913
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Ion formation by electron impact (1988)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Dissociative attachment and polar dissociation cross sections were measured for the following molecules: HC1, NO, N2O, C6H6, SiH4, Si2H6, and LiH. Direct ionization and dissociative ionization cross sections were determined for the following molecules: H2, D2, N2, O2, He, Ne, Ar, Kr, Xe, H2O, Co, CO2, CH4, SiH4, Sih4, Si2H6, N2*, and NH3. An experimental apparatus for a pulsed extraction technique was fabricated and successfully tested.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: AD-A211367 , AFOSR-89-1102TR
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Electron-Photon Coincidence Calibration Of Photon Detectors (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Absolute and relative detector efficiencies measured. Apparatus uses coincidence-counting techniques to measure efficiency of ultraviolet or vacuum ultraviolet detector at very low radiation intensity. Crossed electron and atomic beams generate photons used to calibrate photon detector. Pulses from electron counter and photon detector(s) processed by standard coincidence-counting techniques. Used to calibrate other detectors or make absolute measurements of incident photon fluxes.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-15644 , NASA Tech Briefs (ISSN 0145-319X); 12; 4; P. 37
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Measuring Transmission Efficiencies Of Mass Spectrometers (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Coincidence counts yield absolute efficiencies. System measures mass-dependent transmission efficiencies of mass spectrometers, using coincidence-counting techniques reminiscent of those used for many years in calibration of detectors for subatomic particles. Coincidences between detected ions and electrons producing them counted during operation of mass spectrometer. Under certain assumptions regarding inelastic scattering of electrons, electron/ion-coincidence count is direct measure of transmission efficiency of spectrometer. When fully developed, system compact, portable, and used routinely to calibrate mass spectrometers.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-16989 , NASA Tech Briefs (ISSN 0145-319X); 13; 6; P. 58
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Pulsed Electron Gun (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Magnetically-collimated electron gun generates electron pulses with peak instantaneous currents of approximately microA with pulse widths of approximately 0.35 ns.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-16235 , NASA Tech Briefs (ISSN 0145-319X); 11; 4; P. 32
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    NASA TECHNICAL REPORTS
  • 6
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    Electron-impact ionization and electron attachment cross sections of radicals important in transient gaseous discharges (1990)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Electron-impact ionization and electron attachment cross sections of radicals and excited molecules were measured using an apparatus that consists of an electron beam, a molecular beam and a laser beam. The information obtained is needed for the pulse power applications in the areas of high power gaseous discharge switches, high energy lasers, particle beam experiments, and electromagnetic pulse systems. The basic data needed for the development of optically-controlled discharge switches were also investigated. Transient current pulses induced by laser irradiation of discharge media were observed and applied for the study of electron-molecule reaction kinetics in gaseous discharges.
    Keywords: LASERS AND MASERS
    Type: AD-A217510
    Format: text
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    NASA TECHNICAL REPORTS
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