| 摘要 |
An ion mobility spectrometer is provided including at least one ionization chamber ( 1 ), which can be passed through by analyte-containing gas and at least one radiation source ( 2 ), from which ionizing radiation which is suitable for at least partially ionizing the analyte-containing gas enters the ionization chamber ( 1 ). At least one transition area ( 3 ) is provided, into which the at least partially ionized gas as ion carrier gas ( 4 ) and an almost ion-free gas as drift gas ( 5 ) can be charged in a way that, at least at the end of the transition area ( 3 ), a flow is established, in which cross-sectional areas ( 6 ) are mainly passed through by ion carrier gas ( 4 ) and other cross-sectional areas ( 7, 7 ') are mainly passed through by drift gas ( 5 ). At least one separation area ( 8 ) is provided lying in the direction of flow behind the transition area ( 3 ), in which, likewise, cross-sectional areas are mainly passed through by ion carrier gas ( 4 ) and other cross-sectional areas are mainly passed through by drift gas ( 5 ). The drift gas ( 5 ) and ion carrier gas ( 4 ) flow unidirectionally, and the cross-sectional areas ( 6 ) that are mainly passed through by ion carrier gas ( 4 ) are smaller at least in one dimension than the cross-sectional areas ( 7, 7 ') that are mainly passed through by drift gas ( 5 ).
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