3.1.2.3.2 Comparative studies of image states and surface states

In this paper image-induced surface states at metal surfaces will be discussed, and the transition from image states to image resonances in those cases where they disperse into the bulk continuum. The behavior is particularly interesting in the case of Fe(110) where the spin-split image states disperse into the spin-split continua and show different surface resonance behavior. The surface state-surface resonance transition can be simply understood in terms of an embedding potential which describes their interaction with the crystal.

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Empty surface states, image states, and band edge on Au(111)

Physical Review B ◽

10.1103/physrevb.34.764 ◽

1986 ◽

Vol 34 (2) ◽

pp. 764-767 ◽

Cited By ~ 72

Author(s):

D. P. Woodruff ◽

W. A. Royer ◽

N. V. Smith

Keyword(s):

Surface States ◽

Band Edge ◽

Image States

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Zero-loss omega-filtered REM and RHEED on the new Zeiss 912

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100087392 ◽

1991 ◽

Vol 49 ◽

pp. 616-617

Author(s):

J.C.H. Spence ◽

J. Mayer

Keyword(s):

Electron Microscopy ◽

Materials Science ◽

Surface States ◽

Ccd Camera ◽

Dark Field ◽

Ion Pump ◽

Magnetic Imaging ◽

Reflection Electron Microscopy ◽

Diffraction Patterns ◽

Large Background

The Zeiss 912 is a new fully digital, side-entry, 120 Kv TEM/STEM instrument for materials science, fitted with an omega magnetic imaging energy filter. Pumping is by turbopump and ion pump. The magnetic imaging filter allows energy-filtered images or diffraction patterns to be recorded without scanning using efficient parallel (area) detection. The energy loss intensity distribution may also be displayed on the screen, and recorded by scanning it over the PMT supplied. If a CCD camera is fitted and suitable new software developed, “parallel ELS” recording results. For large fields of view, filtered images can be recorded much more efficiently than by Scanning Reflection Electron Microscopy, and the large background of inelastic scattering removed. We have therefore evaluated the 912 for REM and RHEED applications. Causes of streaking and resonance in RHEED patterns are being studied, and a more quantitative analysis of CBRED patterns may be possible. Dark field band-gap REM imaging of surface states may also be possible.

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