Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Patent
1989-05-19
1990-06-05
Howell, Janice A.
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
250292, 250281, 250282, 250294, H01J 4938
Patent
active
049316400
ABSTRACT:
An ion cyclotron resonance cell (20) in which samples are analyzed has plates (21, 22) serving as excitation electrodes, top and bottom plates (25, 26) serving as detector electrodes and end trapping plates (23, 24). The cell (20) is maintained in a magnetic field of flux density B oriented longitudinally between the end trapping plates (23, 24). An ion generating source (30) causes ionization of the sample molecules within the cell (20). An electrostatic trapping potential is applied to the end trapping plates (23, 24) to prevent ions from escaping in the direction of the magnetic field B. Grounded screens (40, 41) are positioned within the cell (20) just inside the end trapping plates (23, 24) to reduce an electrostatic electric field in the cell (20) resulting from the application of a potential to the end trapping plates (23, 24).
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Marshall Alan G.
Wang Mingda
Howell Janice A.
Nguyen Kiet T.
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