A Comparative Scanning Tunneling Microscopy Study of Physisorbed Linear Quadrupolar Molecules: C2N2 and CS2 on Au{111} at 4 K
| Autor: | Patrick Han, Paul S. Weiss, E. C. H. Sykes, T. P. Pearl |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | The Journal of Physical Chemistry A. 107:8124-8129 |
| ISSN: | 1520-5215 1089-5639 |
| DOI: | 10.1021/jp0226432 |
| Popis: | Submonolayer and near-monolayer coverages of cyanogen (C2N2) and carbon disulfide (CS2) were independently dosed and studied on Au{111} at 4 K. Low-temperature scanning tunneling microscopy was used to investigate the intermolecular and substrate−adsorbate interactions of each of the two chemical species. Both molecules were found to be weakly physisorbed and to form incommensurate structures with respect to the Au{111} lattice. The superlattice formed by the Au{111} reconstruction was determined to have a pronounced effect on the aggregation of the adsorbates. C2N2 with a high quadrupole moment does not form an ordered structure and is easily moved by the scanning tunneling microscope tip at 4 K. In contrast, CS2, having a smaller quadrupole moment, forms a molecular herringbone lattice structure. The Au{111} reconstruction also influences the direction of the CS2 ordered domains, aligning the CS2 molecular herringbone lattice unit cell in a 3-fold symmetry. These observations are discussed in terms of t... |
| Databáze: | OpenAIRE |
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