کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5424963 | 1395843 | 2008 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Substrate-termination and H2O-coverage dependent dissociation of H2O on Fe3O4(1Â 1Â 1)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Substrate-termination and H2O-coverage dependent dissociation of H2O on Fe3O4(1Â 1Â 1) Substrate-termination and H2O-coverage dependent dissociation of H2O on Fe3O4(1Â 1Â 1)](/preview/png/5424963.png)
چکیده انگلیسی
The reaction of Fe3O4(1Â 1Â 1) with water vapour has been studied with scanning tunnelling microscopy (STM) and with X-ray and UV-photoemission as a function of water partial pressure and temperature. The photoemission results point to dissociation to form surface hydroxyls at a partial pressure of 10â6Â mbar H2O and a substrate temperature of about 200Â K. At 298Â K it is known that dissociation occurs at around 10â3Â mbar [Kendelewicz et al., Surf. Sci. 453 (2000) 32]. This difference suggests that an intermolecular mechanism of dissociation is involved. It also suggests that the pressure dependence arises from a coverage term rather than differences in the Gibbs Free Energies of the oxide and hydroxide, as previously proposed. The STM results indicate that dissociation takes place on a termination of Fe3O4(1Â 1Â 1) thought to contain a 1/4 monolayer (ML) of Fe3+ ions on top of a close-packed oxygen monolayer.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 602, Issue 6, 15 March 2008, Pages 1155-1165
Journal: Surface Science - Volume 602, Issue 6, 15 March 2008, Pages 1155-1165
نویسندگان
R.S. Cutting, C.A. Muryn, D.J. Vaughan, G. Thornton,