A Prototype Field-Emission Scanning Transmission Electron Microscope
1973 ◽
Vol 31
◽
pp. 296-297
Keyword(s):
A prototype field emission scanning transmission electron microscope has been constructed and is under further development at AEI Scientific Apparatus Limited.The field emission gun has a triode construction, with geometry such as to produce a divergent beam from a virtual source whose position remains substantially constant over a wide range of total accelerating voltages. The gun has been operated satisfactorily from below 10 kV to over 90 kV (upper limit set by power supplies), with the field emission diode voltage typically between 2 kV and 4 kV and total emission of a few microamps. Single-crystal tungsten tips of either (111) or (310) orientation are used, though (310) tips normally produce a superior probe current stability.
1989 ◽
pp. 99-112
◽
2006 ◽
Vol 106
(11-12)
◽
pp. 963-969
◽
Keyword(s):
1975 ◽
Vol 33
◽
pp. 130-131
1976 ◽
Vol 34
◽
pp. 538-539
1972 ◽
Vol 30
◽
pp. 454-455