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dc.contributor.authorXie, ZX
dc.contributor.author谢兆雄
dc.contributor.authorCharlier, J
dc.contributor.authorCousty, J
dc.date.accessioned2012-06-28T01:53:45Z
dc.date.available2012-06-28T01:53:45Z
dc.date.issued2000-03-08
dc.identifier.citationSURFACE SCIENCE,2000,448(2-3):201-211zh_CN
dc.identifier.issn0039-6028
dc.identifier.urihttp://dx.doi.org/10.1016/S0039-6028(99)01193-0
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/13010
dc.description.abstractAdsorption of 2-pyrrolidone and 3-methyl 2-pyrrolidone molecules onto Au (111) surfaces has been studied by using X-ray photoemission spectroscopy (XPS) and scanning tunneling microscopy (STM). In photoemission spectra, Is N peak shows two components at 398.1 and 399.8 eV for the pyrrolidone overlayer while one peak grows up at 398.3 eV for the methyl pyrrolidone layer. STM images show a disordered methyl pyrrolidone overlayer, while the pyrrolidone layer exhibits area with a periodic arrangement, which can be described either as a root 21 x root 21 R+/-11 degrees structure with respect to Au (111) lattice or as a two-dimensional close packing of hexamers. We propose a model based on semi-empirical calculations for optimization of the geometry of an unsupported hexamer formed by six pyrrolidone molecules interacting with their two nearest neighbors through hydrogen bonds. In this model, the plane of each molecule is tilted with respect to the substrate, which yields a molecule-molecule distance equal to 0.5 nm in good agreement with STM measurements. Finally, the nature of the bonding between pyrrolidone and methyl pyrrolidone molecules and gold atoms is discussed from STM data and XPS spectra. (C) 2000 Elsevier Science B.V. All rights reserved.zh_CN
dc.language.isoenzh_CN
dc.publisherELSEVIER SCIENCE BVzh_CN
dc.subjectgoldzh_CN
dc.subjectscanning tunneling microscopyzh_CN
dc.subjectself assemblyzh_CN
dc.subjectsuperlatticeszh_CN
dc.subjectX-ray photoelectron spectroscopyzh_CN
dc.titleMolecular structure of self-assembled pyrrolidone monolayers on the Au (111) surface: formation of hydrogen bond-stabilized hexamerszh_CN
dc.typeArticlezh_CN


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