By F. J. Himpsel (auth.), Professor Dr. Hans-Joachim Freund, Professor Dr. Eberhard Umbach (eds.)
Adsorption on Ordered Surfaces of Ionic Solids and skinny motion pictures introduces to a brand new and topical box of floor technological know-how for which particularly little event is obtainable at this time. It experiences the hot result of the hired analytical tools comprising all glossy floor concepts together with scanning tunneling microscopy and diverse varieties of electron spectroscopies. the current prestige of this new, truly outlined box of floor technological know-how is almost thoroughly overviewed through contributions from lots of the study teams energetic during this box. The ebook is intended as a foundation for the anticipated swift improvement during this quarter with functions in catalysis, thin-film and semiconductor expertise, sensors, electrochemistry, managed practise of ultrathin epitaxial surfaces, and interfaces of insultors in addition to destiny molecular electronics.
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Additional info for Adsorption on Ordered Surfaces of Ionic Solids and Thin Films: Proceedings of the 106th WE-Heraeus Seminar, Bad Honnef, Germany, February 15–18, 1993
A quite different defect site may be produced by an electron beam [9,10]. If a freshly prepared NaC} film is bombarded with electrons of 150 eV (l JiA for several minutes), two new losses are seen in the gap region by electron energy loss spectroscopy (EELS) (Fig. 9). These losses agree with optical absorption of F-centers. In UP spectra no additional features are seen (Fig. 10, top curve). If this surface is exposed to water vapor at room temperature, new peaks are seen (lowest curve in Fig. 10).
Figure 7 shows typical data for the (1/2,0) beam for a pressure of2·10-5 Pa. 05 Kls. Below 77 K we observed two jumps of the intensity and a plateau between them. Stepwise changes in intensity are also observed for other diffracted beams. Changes in the I-V curve of the (10) beam already at the first jump of intensity indicate that the Xe layer is ordered after this jump. In contrast, a disordered layer (not adsorbed on defined sites) would only lead to damping of substrate spots and not change the I-V curves.
Since there is no clear transition from step site to the gas phase, no exact range for this phase can be given in Fig. 6. '§ 10 8 6 l. luss energy (eV) 2 0 Fig. 9: EEL spectra of a defect free Nael film (a) and after electron bombardment (b). ) . 21 HzOods 130K I60K 270K \0 \5 5 hinding cncrgy (cV) o Fig. 10: He IT spectra : (a) after electronbombardment, (b) 2D-phase, (c) water adsorption at defects, (d) adsorption at room temperature (with dissociation). A quite different defect site may be produced by an electron beam [9,10].
Adsorption on Ordered Surfaces of Ionic Solids and Thin Films: Proceedings of the 106th WE-Heraeus Seminar, Bad Honnef, Germany, February 15–18, 1993 by F. J. Himpsel (auth.), Professor Dr. Hans-Joachim Freund, Professor Dr. Eberhard Umbach (eds.)