Electron-impact spectrometer

Details Electron-impact spectrometer Electron-impact spectrometer

1979-11-23

1982-01-05

Dixon, Harold A.

Radiant energy

Electron energy analysis

250310, 250396R, H01J 4000

Patent

active

043096077

ABSTRACT:
The radiant heat of the graphite carrier of a LaB.sub.6 cathode is utilized o heat the input diaphragm of the monochromator of an electron spectrometer by opening up the aperture in the repeller electrode that provides magnetic shielding from the heating current and through which the emitting portion of the cathode projects, so that the entire surface of the graphite carrier can radiate heat towards the input diaphragm. The spacing of the point of the cathode from the graphite carrier may be increased in order to accord with the provision of additional heat in the carrier for radiation to the diaphragm. The radiant heat raises the temperature of the diaphragm and thereby reduces electrostatic charges resulting from bombardment of the diaphragm by electrons from the cathode, allowing a larger beam current to be monochromatized.

REFERENCES:
patent: 3699331 (1972-10-01), Palmberg
patent: 3742214 (1973-06-01), Helmer et al.
patent: 3786268 (1974-01-01), Nomura

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