Field electron emission from transition metals with d-type unsaturated electronic surface states

A clean [111]-oriented rhodium field emitter and epitaxially grown silver- and gold overlayers on this Rh emitter were imaged with field-ion (FI) and field-electron (FE) emission techniques. Transitions from a threefold symmetry of FE patterns of the clean Rh surface to a sixfold symmetry of corresp...

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Bibliographic Details
Published in:Surface science 1993-08, Vol.293 (1), p.L853-L856
Main Authors: Suchorski, Yu, Schmidt, W.A., Block, J.H., Medvedev, V.K.
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Metals. Metallurgy
Physics
Solid surfaces and solid-solid interfaces
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:A clean [111]-oriented rhodium field emitter and epitaxially grown silver- and gold overlayers on this Rh emitter were imaged with field-ion (FI) and field-electron (FE) emission techniques. Transitions from a threefold symmetry of FE patterns of the clean Rh surface to a sixfold symmetry of corresponding patterns of silver- and gold-covered tips were observed. Any changes in the local geometry of these surfaces can be excluded during the overlayer deposition as checked by simultaneous field ion imaging. The role of unsaturated electronic surface states (ESS) of d-type in the observed phenomenon is discussed.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(93)90234-B