Apparatus comprising a double-collector electron multiplier for

Details Apparatus comprising a double-collector electron multiplier for Apparatus comprising a double-collector electron multiplier for

1984-11-08

1987-09-01

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Beam of atomic particles

250283, 313103CM, 324 714, G01N 2700

Patent

active

046911600

ABSTRACT:
In an apparatus for counting ions, a double-collector electron multiplier comprises a first and a second collector for receiving secondary electrons from an exit end of a dynode member of the electron multiplier. The first and the second collectors have a first and a second electron receiving surface, respectively, wherein the second electron receiving surface has a narrower area than the first electron receiving surface. A first and a second amplifier are separately used in amplifying a first and a second electric current produced from the first and the second collectors, respectively. An ammeter is connected through a switch selectively to the first and the second amplifiers to provide a selected measuring range for the number of ions which enter the electron multiplier.

REFERENCES:
patent: 2285126 (1942-06-01), Rajchman et al.
patent: 2292847 (1942-08-01), Rajchman
patent: 3622827 (1971-11-01), Shriner
patent: 3644775 (1972-02-01), Damioth et al.

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