Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means
Reexamination Certificate
2006-05-24
2008-08-26
Nguyen, Kiet T (Department: 2881)
Radiant energy
Ionic separation or analysis
Ion beam pulsing means with detector synchronizing means
C250S287000
Reexamination Certificate
active
07417224
ABSTRACT:
An ion mobility spectrometer is provided with at least one ionization chamber (1) through which analyte-containing gas can flow. A radiation source (2) is provided from which ionizing radiation is suitable for ionizing the analyte-containing gas at least partially, enters the ionization space (1). A separation area is located behind the ionization space (1) in the direction of flow, into which the partially ionized gas is admitted as an ion carrier gas (4) and a nearly ion-free gas is admitted as a drift gas (5) in such a way that a flow in which predominantly ion carrier gas (4) flows through cross-sectional areas (6) and predominantly drift gas (5) flows through other cross-sectional areas (7, 7′), becomes established at least in the inlet area of the separation area (8). The drift gas (5) and ion carrier gas (4) flow unidirectionally and the cross-sectional areas (6), through which predominantly ion carrier gas (4) flows, are smaller in at least one dimension than the cross-sectional areas (7, 7′), through which predominantly drift gas (5) flows.
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Spangler et al., Membrane Inlet for Ion Mobility Spectrometry (Plasma Chromatography), Journal, Mar. 21, 1983, 267-287, International Journal of Mass Spectrometry and Ion Physics, 52 (1983) 267-287 Elsevier Science Publishers B.V., Amsterdam—Printed in the Netherlands.
Bäther Wolfgang
Zimmermann Stefan
Dräger Saftey AG & Co. KGaA
McGlew & Tuttle P.C.
Nguyen Kiet T
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