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  • 1
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    Interference with negative particle sampling due to formation of positive ions in a quadrupole mass spectrometer (1980)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A quadrupole mass spectrometer has been utilized to study active discharges containing Cs vapor. Production of positive ions by electron impact within the mass spectrometer and subsequent secondary electron emission from cesiated surfaces produced spurious or pseudonegative ion signals which interfered with attempts to sample negative ions from the plasma. These effects may also occur in other gas discharge systems.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Applied Physics; 51; Dec. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Negative and positive cesium ion studies (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Mass spectrometric analyses have been performed on the positive and negative species from discharges in Cs, He-Cs, and He-H2-Cs mixtures. Sampling was conducted through the electrodes of normal glow discharges and from close-spaced heated-cathode conditions, which approximate a cesium thermionic converter. No negative Cs ions were observed for Cs pressures less than .01 torr. Identified species included Cs(+), Cs2(+), Cs(-), and what appeared to be multiply charged ions. Low-mass negative and positive ions attributed to H2 were observed when an He-H2 mixture was also present in the discharge region.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Applied Physics Letters; 33; Dec. 1
    Format: text
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    NASA TECHNICAL REPORTS
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