| 摘要 |
There is disclosed an ion mobility detector having a sample inlet membrane (24), means for flowing a sample passing through the membrane (24) over an ionisation source (26) to an ion reaction region (27), with which one or more ion drift regions (10A, 10B) communicate, means (30 A1 to 30 A4, 30 B1 to 30 B4) for impressing a potential gradient on the or each drift region (10A, 10B), an ion injection shutter (28A, 28B) at the entrance to the or each drift region whereby the drift region can be made accessible or inaccessible to ions of a particular sign located in the reaction region (27), an ion detector (32A, 32B) in the or each drift region, means (34A, 34B) for passing drift gas down the or each drift region to the reaction region and exit means (22) in the reaction region (27) remote from the ionisation source (26) for venting drift gas from the reaction region (27), a source (25, 46) of alternating potential being connected to the ionisation source (26). <IMAGE>
|
