TY - JOUR
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, P. K.
AU - Prince, R. H.
AU - Diehl, R. D.
N1 - Funding Information:
We thank J. Stevens for technical assistance during these experiments. This work was supported by NSF Grant No. DMR-0505160 .
PY - 2013/4
Y1 - 2013/4
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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U2 - 10.1016/j.susc.2013.01.004
DO - 10.1016/j.susc.2013.01.004
M3 - Article
AN - SCOPUS:84874301382
SN - 0039-6028
VL - 610
SP - 42
EP - 47
JO - Surface Science
JF - Surface Science
ER -