Radiant energy – Ionic separation or analysis
Patent
1977-05-10
1978-11-21
Smith, Alfred E.
Radiant energy
Ionic separation or analysis
250282, 250305, 250396R, B01D 5944, H01J 3934
Patent
active
041267818
ABSTRACT:
Electric fields for electrostatic optics for focusing or otherwise controlling beams of ions, electrons and charged particles in general produced by surface current distributions which flow on appropriately shaped and located resistive elements from electrical power sources of appropriate voltage connected to two or more points or regions of the resistive surfaces; the resulting electric fields in the proximity of the current carrying surfaces are parallel to these surfaces. Useful electric field configurations may be produced which are inconvenient or impossible to produce by the prior art using surface charge distributions. New and improved analyzers of "concentric hemisphere" and "parallel plate" types are specifically utilized for ion kinetic energy selection prior to measurement of the mass-to-charge ratio of secondary ions produced by primary ion bombardment of surfaces.
REFERENCES:
patent: 2313018 (1943-03-01), Krause
patent: 3760186 (1973-09-01), Staib
patent: 3914606 (1975-10-01), Hashimoto et al.
patent: 3936634 (1976-02-01), Fite
patent: 4002912 (1977-01-01), Johnson
Anderson B. C.
Extranuclear Laboratories Inc.
Smith Alfred E.
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