Detector for heavy ions following mass analysis

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

1976-08-03

1978-06-06

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Methods

250292, 250281, H01J 3934

Patent

active

040938557

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: 3402358 (1968-09-01), Wharton
patent: 3433944 (1969-03-01), George
patent: 3641340 (1972-02-01), Grimten et al.
patent: 3973121 (1976-08-01), Fite et al.

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