Electrode structure for drift tube in ion mobility spectrometer

Details Electrode structure for drift tube in ion mobility spectrometer Electrode structure for drift tube in ion mobility spectrometer

2009-05-27

2010-12-14

Berman, Jack I (Department: 2881)

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

C250S281000, C250S282000, C250S288000, C250S290000, C250S292000

Reexamination Certificate

active

07851747

ABSTRACT:
Disclosed is an electrode structure for a drift tube in IMS comprising a ring electrode, for each of two surfaces of the ring electrode, at least a part adjacent to the inner radius is formed into a cone, and the angles formed between the cones and the axis of the ring electrode are different from each other. The electrode structure of the present invention can alleviate, even eliminate, the accumulation of space charges in the drift tube. Such structure is particularly suitable when the electric field in the drift tube is low in strength or a great number of ions pass through. Meanwhile, the structure allows a significant decrease in the size of the outer radius of the electrode, while the inner radius remains constant. In this way, it is possible to effectively reduce the outline size of the drift tube and thus make the IMS compact.

REFERENCES:
patent: 4390784 (1983-06-01), Browning et al.
patent: 5280175 (1994-01-01), Karl
patent: 6051832 (2000-04-01), Bradshaw
patent: 6229143 (2001-05-01), Wernlund
patent: 6897437 (2005-05-01), Fuhrer et al.
patent: 7164122 (2007-01-01), Fuhrer et al.

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