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STM Observation of Pt{111}(3$\times$3)-CI and c(4$\times$2)-CI Structures

  • Song, M.B.
  • Published : 20010300

Abstract

The adsorption of chlorine on a Pt(111) surface at 90 K has been studied using scanning tunneling microscopy (STM) in ultra-high vacuum environments. The adsorbed chlorine atoms give rise to two different ordered structures, (3${\times}$3)-Cl and c(4${\times}$2)- Cl, depending on the coverage. It has been determined from the STM image that the absolute coverage of (3${\times}$3)-Cl structure is 0.44, which is not in agreement with coverage calibrated by a low energy electron diffraction technique together with an Auger electron spectrometer and a thermal desorption spectrometer. The Cl atoms bound to on-top sites at the Pt(111)(3${\times}$3)-Cl surface appeared to effectively perturb the density of states of Pt atoms, as compared with that bound to bridging sites. The other ordered structure, c(4${\times}$2)-Cl, with small domain sizes, consists of both on-top and bridge-bonded species with a saturation coverage of 0.5.

Keywords

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  2. A DFT study of chlorine coverage over late transition metals and its implication on 1,2-dichloroethane hydrodechlorination vol.8, pp.6, 2018, https://doi.org/10.1039/c7cy02647a