| 摘要 |
FIELD: investigating or analyzing materials. ^ SUBSTANCE: device comprises flowing passage that has ionization chamber, unit for separating ions , and system for collecting ions. The ionization chamber has inlet branch pipe for supplying the gas to be analyzed and source of ionization. The ion-separating unit is made of a drift space defined by the coaxial central and outer electrodes connected with the sources of direct compensating voltage and alternating asymmetrical voltage. The additional flowing passage is made of conducting material, is connected with the outer electrode, and is interposed between the drift space and system for collecting ions coaxially to the drift space. The inlet of the additional passage is connected with the outlet of the drift space. The outlet of the additional passage is connected with the inlet of the system for collecting ions. The length of the additional passage should be sufficient to exclude the effect of alternating asymmetrical voltage of the drift space on the system for collecting ions. ^ EFFECT: enhanced sensitivity. ^ 2 cl, 2 dwg
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