کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5425083 | 1395847 | 2008 | 10 صفحه PDF | دانلود رایگان |

The local adsorption geometry of benzenethiolate in the ordered c(2 Ã 6) phase on Cu(1 0 0) has been investigated by a combination of S K-edge near-edge X-ray absorption fine structure (NEXAFS), normal incidence X-ray standing waves (NIXSW) and S 1s scanned-energy mode photoelectron diffraction (PhD). NEXAFS and PhD show that the molecular plane is tilted from the surface normal by 20 ± 15°, while NIXSW clearly identifies the S head-group as occupying the four-fold coordinated hollow sites. PhD shows the S atoms lies 1.34 ± 0.04 à above the outermost Cu atomic layer, leading to a Cu-S bondlength of 2.25 ± 0.02 à . The combination of the PhD and NIXSW results shows the Cu surface layer has an outward relaxation of 0.15 ± 0.06 à . Possible origins for this large adsorbate-induced relaxation are discussed.
Journal: Surface Science - Volume 602, Issue 14, 15 July 2008, Pages 2453-2462