ESCA study of fractional monolayer quantities of chemisorbed gases on tungsten
TL;DR: In this paper, the X-ray photoelectron spectroscopy (ESCA) has been used in a study of CO and O2 chemisorbed on polycrystalline tungsten sample.
About: This article is published in Chemical Physics Letters.The article was published on 1973-04-15. It has received 103 citations till now. The article focuses on the topics: Monolayer & Tungsten.
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TL;DR: In this paper, the surface chemistry of the nickel-oxygen system using both temperature changes and ion bombardment as techniques for elucidating the surface structure was studied using both X-ray photoelectron lines and the Auger transitions.
737 citations
TL;DR: In this article, the authors investigated the influence of surface structure on the catalytic activity of a single crystal whose surface was curved in such a way that not only the plane but also vicinals with varying step density of two different crystallographic directions were present.
Abstract: Publisher Summary Catalytic oxidation of carbon monoxide over catalysts from the platinum group metals has been investigated. Apart from its enormous practical importance, this reaction is considered to proceed through a relatively simple mechanism because only diatomic molecules are involved and product formation occurs presumably only over a very few steps. This chapter discusses the adsorptive properties of the reactants, their mutual interaction, and the mechanism and kinetics of product formation as well as the investigations with well defined single-crystal surfaces. The activity of a catalyst for a particular reaction is strongly dependent on the surface structure. Directive investigation of the influence of the surface structure on the catalytic activity was performed by using a platinum single crystal whose surface was curved in such a way that not only the plane but also vicinals with varying step density of two different crystallographic directions were present.
493 citations
TL;DR: A comprehensive review about the versatility of photoelectron spectroscopy to study the especially complex interaction of oxygen with metal surfaces and the nature of the reaction products can be found in this paper.
473 citations
TL;DR: In this paper, a theoretical and experimental study of the application of x-ray-photoelectron angular distribution measurements to quantitative surface characterizations is presented, including certain new generalizations and special cases pertinent to surface analysis.
358 citations
TL;DR: In this article, the authors used X-ray photoelectron spectroscopy (XPS) to study the complex surface chemistry of the ruthenium-oxygen system as a function of temperature and under the influence of Ar+ and O2+ ion-bombardment.
323 citations
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TL;DR: In this paper, a simple theory relating the Auger electron range to this dependence and to the quantitative use of electron spectroscopy is developed, and the range between 2 and 7 monolayers is obtained.
344 citations
204 citations
TL;DR: In this paper, the interaction of O 2 with a single crystal W(100) surface at 300K has been examined using a combination of techniques, where a precision gas dosing system was used to deposit O 2 onto the crystal; the absolute accuracy in the average flux F (molecules cm −2 s −1 ) is ± 6 %.
155 citations
TL;DR: In this article, the interaction of oxygen with a polycrystalline W filament has been studied in the temperature range 300-1200°K and for exposures between 10−7 and 1'torr·sec.
Abstract: The interaction of oxygen with a polycrystalline W filament has been studied in the temperature range 300–1200°K and for exposures between 10−7 and 1 torr·sec. Both sticking probabilities and desorption spectra have been measured. After low exposures (〈2×10−6 torr·sec) the adsorbate is all desorbed as O atoms with first order kinetics. With higher exposures, oxygen is removed as oxides: WO, WO2, WO3, W2O6. The desorption spectra for each of these species are complex, and nine distinct and reproducible oxide states are identified. Saturation coverages in each of these states are independent of adsorption temperature in the range 300–1200°K. At a total coverage of 8.5×1014 O2 molecules cm−2, 2.2×1014 O2 molecules cm−2 are desorbed as oxides; after exposures 〉 10−2 torr·sec at 300°K, the total uptake rises to 15×1014 O2 molecules cm−2. At temperatures between 500 and 1000°K and exposure up to 1 torr·sec, a multilayer oxide film is formed of unlimited thickness. The desorption product from this oxide film is ...
131 citations