Light reflecting electrostatic electron lens

Details Light reflecting electrostatic electron lens Light reflecting electrostatic electron lens

1977-04-04

1978-06-20

Dixon, Harold A.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

250311, 313257, G01M 2300

Patent

active

040963861

ABSTRACT:
An improved electrostatic electron lens for photoelectron emission microscopes is disclosed, having a planar upper surface on its beam entrance electrode highly polished to a mirror finish for light reflection. The lens is positioned between a light source and a specimen holder such that light may be reflected off the planar upper surface of the entrance electrode onto the specimen for causing photoemission of electrons from such specimen. The lens is constructed to enable expansion of the lens electrodes during heating, such as "bake-out" to remove adsorbed gases, without breaking the insulators between such electrodes. An intermediate electrode is disposed in a spaced, insulated relationship between the beam entrance electrode and an exit electrode by two insulator members. This intermediate electrode is provided with an outer annular shoulder portion circumferentially disposed about its outer periphery cooperating in an abutting and overlapping relationship with an inner annular shoulder projection circumferentially disposed about one insulator, allowing the intermediate electrode to expand radially outward during heating without fracturing the insulators.

REFERENCES:
patent: 2313018 (1943-03-01), Krause
patent: 2459277 (1949-01-01), Halstead et al.
patent: 2551542 (1951-05-01), Marsh et al.
patent: 2617041 (1952-11-01), Fleming
patent: 3252039 (1966-05-01), Claypool
patent: 3349283 (1967-10-01), Krefft

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