Magnesium oxide dynode and method of preparation

Details Magnesium oxide dynode and method of preparation Magnesium oxide dynode and method of preparation

1976-02-19

1978-05-09

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

427 77, 427 78, 427350, 427295, 148 315, 428469, C23F 706, H01J 132

Patent

active

040885100

ABSTRACT:
A layer of near stoichiometric magnesium oxide on a conducting substrate forms a dynode. The dynode is formed by preparing a layer of oxidized magnesium on a conducting substrate, heating the oxidized magnesium layer in a vacuum between about 400.degree. and about 500.degree. C., and treating the layer to render it more nearly stoichiometric. One method of treating the layer is to expose it to oxygen at about room temperature for about ten to twenty minutes at a pressure between about 10.sup.-6 to 10.sup.-5 torr. Another method of treating the layer is to impinge a noble gas, such as argon, at a pressure suitable for sputter etching, such as between 10.sup.-6 and 10.sup.-3 torr, to remove between ten and twenty atomic layers from the surface of the layer. The layer is then exposed to oxygen at room temperature for about ten to twenty minutes at a pressure between about 10.sup.-6 and 10.sup.-5 torr.

REFERENCES:
patent: 2548514 (1951-04-01), Bramley
patent: 2708726 (1955-05-01), Atherton
patent: 2784123 (1957-03-01), Rappaport
patent: 2878093 (1959-03-01), Wargo

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