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Title: Investigation of the structures of sulfur on Mo(100) by scanning tunneling microscopy

Abstract

The structures of the four ordered overlayers of sulfur on the Mo(100) surface were investigated by scanning tunneling microscopy (STM). In order of increasing sulfur coverage, the overlayers have [ital c](2[times]2), [vert bar][sub 1][sup 2] [sub 1][sup [bar 1]][vert bar], [ital c](4[times]2), and [ital p](2[times]1) low energy electron diffraction (LEED) patterns. Only the [ital c](2[times]2) overlayer geometry has been determined from LEED [ital I]([ital V]) analysis. An examination of point and line defects and domain boundaries in STM images provides information beyond that known from LEED on the required symmetries of the ordered overlayers. Several proposed structures were shown to be incompatible with these symmetries and therefore discarded. Only one model of the [ital c](4[times]2) structure was found to be consistent with the symmetry of the STM images. This structure contains sulfur atoms occupying exclusively fourfold hollow sites. Unexpectedly, STM images of the surface with the [ital p](2[times]1) LEED pattern did not have [ital p](2[times]1) symmetry, but consisted of small domains of the [ital c](4[times]2) structure.

Authors:
 [1]; ; ;  [2]
  1. Center for Advanced Materials, Materials Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 and Department of Physics, University of California at Berkeley, Berkeley, California 94720 (United States)
  2. Center for Advanced Materials, Materials Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
Publication Date:
OSTI Identifier:
6238039
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States)
Additional Journal Information:
Journal Volume: 11:4; Journal ID: ISSN 0734-2101
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MOLYBDENUM; COATINGS; SULFUR; CRYSTAL STRUCTURE; ADSORPTION; ELECTRON DIFFRACTION; LINE DEFECTS; MONOCRYSTALS; POINT DEFECTS; SCANNING ELECTRON MICROSCOPY; COHERENT SCATTERING; CRYSTAL DEFECTS; CRYSTALS; DIFFRACTION; ELECTRON MICROSCOPY; ELEMENTS; METALS; MICROSCOPY; NONMETALS; SCATTERING; SORPTION; TRANSITION ELEMENTS; 360602* - Other Materials- Structure & Phase Studies

Citation Formats

Dunphy, J C, Sautet, P, Ogletree, D F, and Salmeron, M B. Investigation of the structures of sulfur on Mo(100) by scanning tunneling microscopy. United States: N. p., 1993. Web. doi:10.1116/1.578533.
Dunphy, J C, Sautet, P, Ogletree, D F, & Salmeron, M B. Investigation of the structures of sulfur on Mo(100) by scanning tunneling microscopy. United States. https://doi.org/10.1116/1.578533
Dunphy, J C, Sautet, P, Ogletree, D F, and Salmeron, M B. 1993. "Investigation of the structures of sulfur on Mo(100) by scanning tunneling microscopy". United States. https://doi.org/10.1116/1.578533.
@article{osti_6238039,
title = {Investigation of the structures of sulfur on Mo(100) by scanning tunneling microscopy},
author = {Dunphy, J C and Sautet, P and Ogletree, D F and Salmeron, M B},
abstractNote = {The structures of the four ordered overlayers of sulfur on the Mo(100) surface were investigated by scanning tunneling microscopy (STM). In order of increasing sulfur coverage, the overlayers have [ital c](2[times]2), [vert bar][sub 1][sup 2] [sub 1][sup [bar 1]][vert bar], [ital c](4[times]2), and [ital p](2[times]1) low energy electron diffraction (LEED) patterns. Only the [ital c](2[times]2) overlayer geometry has been determined from LEED [ital I]([ital V]) analysis. An examination of point and line defects and domain boundaries in STM images provides information beyond that known from LEED on the required symmetries of the ordered overlayers. Several proposed structures were shown to be incompatible with these symmetries and therefore discarded. Only one model of the [ital c](4[times]2) structure was found to be consistent with the symmetry of the STM images. This structure contains sulfur atoms occupying exclusively fourfold hollow sites. Unexpectedly, STM images of the surface with the [ital p](2[times]1) LEED pattern did not have [ital p](2[times]1) symmetry, but consisted of small domains of the [ital c](4[times]2) structure.},
doi = {10.1116/1.578533},
url = {https://www.osti.gov/biblio/6238039}, journal = {Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States)},
issn = {0734-2101},
number = ,
volume = 11:4,
place = {United States},
year = {Thu Jul 01 00:00:00 EDT 1993},
month = {Thu Jul 01 00:00:00 EDT 1993}
}