Use of predissociation to enhance the atomic hydrogen ion fracti

Details Use of predissociation to enhance the atomic hydrogen ion fracti Use of predissociation to enhance the atomic hydrogen ion fracti

1978-01-24

1979-01-16

Dixon, Harold A.

Radiant energy

Ion generation

Field ionization type

250426, H01J 2700

Patent

active

041350936

ABSTRACT:
A duopigatron ion source is modified by replacing the normal oxide-coated wire filament cathode of the ion source with a hot tungsten oven through which hydrogen gas is fed into the arc chamber. The hydrogen gas is predissociated in the hot oven prior to the arc discharge, and the recombination rate is minimized by hot walls inside of the arc chamber. With the use of the above modifications, the atomic H.sub.1.sup.+ ion fraction output can be increased from the normal 50% to greater than 70% with a corresponding decrease in the H.sub.2.sup.+ and H.sub.3.sup.+ molecular ion fraction outputs from the ion source.

REFERENCES:
patent: 3740554 (1973-06-01), Morgan
"A Low Current -- Ion Source" by Steinberg et al., The Review of Sci. Inst., vol. 42, No. 3, Mar. 1971, pp. 354, 355.

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