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    • 9. 发明授权
    • Reversal electron attachment ionizer for detection of trace species
    • 用于检测痕量物质的反转电子附着电离器
    • US4933551A
    • 1990-06-12
    • US361531
    • 1989-06-05
    • Mark T. BerniusAra Chutjian
    • Mark T. BerniusAra Chutjian
    • G01N27/64H01J27/02H01J49/00H01J49/02
    • H01J49/147G01N27/64H01J27/028H01J49/06
    • An in-line reversal electron, high-current ionizer capable of focusing a beam of electrons to a reversal region and executing a reversal of said electrons, such that the electrons possess zero kinetic energy at the point of reversal, may be used to produce both negative and positive ions. A sample gas is introduced at the point of electron reversal for low energy electron-(sample gas) molecule attachment with high efficiency. The attachment process produces negative ions from the sample gas, which includes species present in trace (minute) amounts. These ions are extracted efficiently and directed to a mass analyzer where they may be detected and identified. The generation and detection of positive ions is accomplished in a similar fashion with minimal adjustment to potentials applied to the apparatus.
    • 能够将电子束聚焦到反转区域并执行所述电子的反转的直线反转电子大电流电离器,使得电子在反转点处具有零动能,可用于产生两者 负离子和正离子。 在低能量电子(样品气体)分子附着的电子反转点处引入样品气体,效率高。 附着过程从样品气体产生负离子,其包括痕量(分钟)量的物质。 这些离子被有效地提取并引导到质量分析器,在那里可以检测和识别它们。 以类似的方式实现正离子的产生和检测,同时对施加到装置上的电位进行最小调节。