Geometry of the Ge(111)-Au([radical]3 [times] [radical]3 )[ital R]30[degree] reconstruction

Journal Article · Mon Aug 15 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.4470· OSTI ID:7005244

Goethelid, M; Hammar, M; Bjoerkqvist, M; Karlsson, U O; Flodstroem, S A ^[1]; Wigren, C ^[2]; LeLay, G ^[3]

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1. Department of Physics, Materials Physics, Royal Institute of Technology, S-10044 Stockholm (Sweden)
2. Stanford Synchrotron Radiation Laboratory, Stanford Linear Accelerator Center, P. O. Box 4349, MS 99, Stanford, California 94309-0210 (United States)
3. Centre de Recherche sur les Mecanismes de la Croissance Cristalline Centre National de la Recherche Scientifique, Campus de Luminy, Case 913, F-13288 Marseille Cedex 09 (France)

A structure model for the Ge(111)-Au([radical]3 [times] [radical]3 )[ital R]30[degree] surface reconstruction is proposed based on scanning tunneling microscopy (STM) and photoelectron spectroscopy on the Ge 3[ital d] and Au 4[ital f] core lines. The basic unit is a Au[sub 3]Ge molecule binding in one-third of the [ital T][sub 1] substrate sites with a gold trimer pointing out of the surface. This leaves two-thirds of a monolayer of unoccupied [ital T][sub 1] sites which make up a hexagonal honeycomb pattern. Two types of STM images have been obtained which are explained within this model, where either the trimers or the substrate Ge atoms are probed depending on the specific tip conditions in combination with the sample bias voltage. Furthermore, small insets of a metallic (1[times]1) structure are found at low gold coverage together with a distorted (2[times]2) surface structure.

• OSTI ID: 7005244
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:7; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
CHEMICAL REACTIONS
CHEMISORPTION
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ELEMENTS
EPITAXY
GERMANIUM
GOLD
METALS
MICROSCOPY
PHOTOELECTRON SPECTROSCOPY
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS