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    Development of an improved field ionization detector incorporating a secondary electron stage

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    Authors
    Fahy, A.
    O’Donnell, Kane
    Barr, M.
    Zhou, X.
    Allison, W.
    Dastoor, P.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Fahy, A. and O’Donnell, K. and Barr, M. and Zhou, X. and Allison, W. and Dastoor, P. 2011. Development of an improved field ionization detector incorporating a secondary electron stage. Measurement Science and Technology. 22: Article ID 115902.
    Source Title
    Measurement Science and Technology
    DOI
    10.1088/0957-0233/22/11/115902
    ISSN
    0957-0233
    School
    Department of Imaging and Applied Physics
    URI
    http://hdl.handle.net/20.500.11937/10372
    Collection
    • Curtin Research Publications
    Abstract

    Field ionization from sharp tips is attracting increased attention for use in detectors for neutral atomic/molecular species. However, the direct detection of the ionized species typically results in low sensitivities due to the small acceptance angle of the receiving ion-sensitive measurement device (usually a channel electron multiplier) and can result in sputtering damage due to the relatively high mass and energy of the incident ion species. Here we present a design for a field-ionization-based neutral atom detector incorporating a simple secondary electron generating stage. The use of such a stage decouples the field-ionized species from the detected electron signal, thus eliminating any sputtering damage to the channel electron multiplier. The detector armature discussed is shown to exhibit a linear response to neutral gas pressure and a sensitivity that is improved by more than two orders of magnitude over a previous field ionization detector design.

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