Detector for heavy ions following mass analysis

Details Detector for heavy ions following mass analysis Detector for heavy ions following mass analysis

1974-04-29

1976-08-03

Lawrence, James W.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250281, 250282, 250425, H01J 3934

Patent

active

039731219

ABSTRACT:
A hot surface detector for heavy ions following their separation on the basis of charge-to-mass ratio. Upon striking the hot surface, the heavy ions decompose and give up their lighter constituent and/or impurity atoms and molecules to the surface. Those constituent and/or impurity atoms and molecules with ionization potentials or electron affinities comparable to the work function of the hot surface become surface ionized and are emitted from the surface as a burst of either positive or negative ions which are then detected by conventional means, including detection at an electrode, by an electron multiplier or by a mass spectrometric detector for light ions. Where negative ions are to be detected, a magnetic field is applied to prevent electrons from the hot surface from reaching the detector.

REFERENCES:
patent: 3258713 (1966-06-01), George
patent: 3328633 (1967-06-01), George
patent: 3402358 (1968-09-01), Wharton
patent: 3433944 (1969-03-01), George
patent: 3641340 (1972-02-01), Grinten et al.
patent: 3808433 (1974-04-01), Fite et al.

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