Au(111) surface structures induced by adsorption: LEED I(E) analysis of (1 × 1) and (5 × 5) Au(111)-S phases

G. M. McGuirk, H. Shin, M. Caragiu, S. Ash, Pradip Bandyopadhyay, R. H. Prince, R. D. Diehl

Research output: Contribution to journalArticle

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Abstract

We report on the various phases formed by sulfur adsorbed on Au(111), at less than 1 monolayer (ML) coverage, as monitored by low-energy electron diffraction (LEED). The phases transform from one to another via coexistence regions. The observation of ordered phases was matched to the coverage information obtained from Auger measurements, using as a calibration point the S coverage of 0.28 ML, corresponding to the sharpest (5 × 5) LEED pattern observed. The influence of emitting filaments (the Auger beam, ion gauge, or LEED electron beam) upon the adsorption itself is discussed. LEED structural investigations were performed on two particular S-Au phases. The analysis of the Au(1 × 1)-S structure provided the values for the first four gold interlayer spacings, showing a 1% expansion of the top layer, interpreted as a remnant of the expansion of the Au(111)-(22 × √3) reconstructed phase. The analysis of the Au(5 × 5)-7S phase confirmed the fcc adsorption site of the S atoms reported previously, and resulted in an average S-Au distance of 1.57 ± 0.10 Å, and an S-Au bond length of 2.29 ± 0.07 Å.

Original languageEnglish (US)
Pages (from-to)42-47
Number of pages6
JournalSurface Science
Volume610
DOIs
StatePublished - Apr 1 2013

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Low energy electron diffraction
Surface structure
electron diffraction
Adsorption
adsorption
Monolayers
ionization gages
expansion
energy
Bond length
Sulfur
Gold
Diffraction patterns
Ion beams
Gages
Electron beams
interlayers
filaments
sulfur
diffraction patterns

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

McGuirk, G. M. ; Shin, H. ; Caragiu, M. ; Ash, S. ; Bandyopadhyay, Pradip ; Prince, R. H. ; Diehl, R. D. / Au(111) surface structures induced by adsorption : LEED I(E) analysis of (1 × 1) and (5 × 5) Au(111)-S phases. In: Surface Science. 2013 ; Vol. 610. pp. 42-47.
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abstract = "We report on the various phases formed by sulfur adsorbed on Au(111), at less than 1 monolayer (ML) coverage, as monitored by low-energy electron diffraction (LEED). The phases transform from one to another via coexistence regions. The observation of ordered phases was matched to the coverage information obtained from Auger measurements, using as a calibration point the S coverage of 0.28 ML, corresponding to the sharpest (5 × 5) LEED pattern observed. The influence of emitting filaments (the Auger beam, ion gauge, or LEED electron beam) upon the adsorption itself is discussed. LEED structural investigations were performed on two particular S-Au phases. The analysis of the Au(1 × 1)-S structure provided the values for the first four gold interlayer spacings, showing a 1{\%} expansion of the top layer, interpreted as a remnant of the expansion of the Au(111)-(22 × √3) reconstructed phase. The analysis of the Au(5 × 5)-7S phase confirmed the fcc adsorption site of the S atoms reported previously, and resulted in an average S-Au distance of 1.57 ± 0.10 {\AA}, and an S-Au bond length of 2.29 ± 0.07 {\AA}.",
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Au(111) surface structures induced by adsorption : LEED I(E) analysis of (1 × 1) and (5 × 5) Au(111)-S phases. / McGuirk, G. M.; Shin, H.; Caragiu, M.; Ash, S.; Bandyopadhyay, Pradip; Prince, R. H.; Diehl, R. D.

In: Surface Science, Vol. 610, 01.04.2013, p. 42-47.

Research output: Contribution to journalArticle

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T1 - Au(111) surface structures induced by adsorption

T2 - LEED I(E) analysis of (1 × 1) and (5 × 5) Au(111)-S phases

AU - McGuirk, G. M.

AU - Shin, H.

AU - Caragiu, M.

AU - Ash, S.

AU - Bandyopadhyay, Pradip

AU - Prince, R. H.

AU - Diehl, R. D.

PY - 2013/4/1

Y1 - 2013/4/1

N2 - We report on the various phases formed by sulfur adsorbed on Au(111), at less than 1 monolayer (ML) coverage, as monitored by low-energy electron diffraction (LEED). The phases transform from one to another via coexistence regions. The observation of ordered phases was matched to the coverage information obtained from Auger measurements, using as a calibration point the S coverage of 0.28 ML, corresponding to the sharpest (5 × 5) LEED pattern observed. The influence of emitting filaments (the Auger beam, ion gauge, or LEED electron beam) upon the adsorption itself is discussed. LEED structural investigations were performed on two particular S-Au phases. The analysis of the Au(1 × 1)-S structure provided the values for the first four gold interlayer spacings, showing a 1% expansion of the top layer, interpreted as a remnant of the expansion of the Au(111)-(22 × √3) reconstructed phase. The analysis of the Au(5 × 5)-7S phase confirmed the fcc adsorption site of the S atoms reported previously, and resulted in an average S-Au distance of 1.57 ± 0.10 Å, and an S-Au bond length of 2.29 ± 0.07 Å.

AB - We report on the various phases formed by sulfur adsorbed on Au(111), at less than 1 monolayer (ML) coverage, as monitored by low-energy electron diffraction (LEED). The phases transform from one to another via coexistence regions. The observation of ordered phases was matched to the coverage information obtained from Auger measurements, using as a calibration point the S coverage of 0.28 ML, corresponding to the sharpest (5 × 5) LEED pattern observed. The influence of emitting filaments (the Auger beam, ion gauge, or LEED electron beam) upon the adsorption itself is discussed. LEED structural investigations were performed on two particular S-Au phases. The analysis of the Au(1 × 1)-S structure provided the values for the first four gold interlayer spacings, showing a 1% expansion of the top layer, interpreted as a remnant of the expansion of the Au(111)-(22 × √3) reconstructed phase. The analysis of the Au(5 × 5)-7S phase confirmed the fcc adsorption site of the S atoms reported previously, and resulted in an average S-Au distance of 1.57 ± 0.10 Å, and an S-Au bond length of 2.29 ± 0.07 Å.

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