Publication

Organometallics on Silicon - a Synchrotron-Radiation Photoemission-Study of the Adsorption of Iron Pentacarbonyl on Si(111) Surfaces with Different Reconstructions

Giorgio Margaritondo
1994
Journal Articles

Abstract

The adsorption behaviour of Si(111)2 x 1 and Si(111)7 x 7 surfaces towards Fe(CO)5 has been investigated in the temperature range 80-300 K and in the exposure range 0.1-1000 L. For both surface reconstructions, the adsorption state is found to be molecular at 80 K, from a comparison with the already reported spectrum for pure Fe(CO)5, in the gas phase, while there is partial decomposition at room temperature. The molecular adsorption state rapidly evolves into a partially decomposed one, corresponding to the adsorption spectrum at room temperature. The decomposition is demonstrated to be photoinduced.

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https://infoscience.epfl.ch/entities/publication/4c7b332f-70e5-49ed-90f2-933c422b529b

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Giorgio Margaritondo
1994
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4c7b332f-70e5-49ed-90f2-933c422b529b

About this result

Related concepts (32)

Adsorption

Adsorption is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface. This process creates a film of the adsorbate on the surface of the adsorbent. This process differs from absorption, in which a fluid (the absorbate) is dissolved by or permeates a liquid or solid (the absorbent). Adsorption is a surface phenomenon and the adsorbate does not penetrate through the surface and into the bulk of the adsorbent, while absorption involves transfer of the absorbate into the volume of the material, although adsorption does often precede absorption.

Langmuir adsorption model

The Langmuir adsorption model explains adsorption by assuming an adsorbate behaves as an ideal gas at isothermal conditions. According to the model, adsorption and desorption are reversible processes. This model even explains the effect of pressure i.e. at these conditions the adsorbate's partial pressure, , is related to the volume of it, V, adsorbed onto a solid adsorbent. The adsorbent, as indicated in the figure, is assumed to be an ideal solid surface composed of a series of distinct sites capable of binding the adsorbate.

Thermodynamic temperature

Thermodynamic temperature is a quantity defined in thermodynamics as distinct from kinetic theory or statistical mechanics. Historically, thermodynamic temperature was defined by Lord Kelvin in terms of a macroscopic relation between thermodynamic work and heat transfer as defined in thermodynamics, but the kelvin was redefined by international agreement in 2019 in terms of phenomena that are now understood as manifestations of the kinetic energy of free motion of microscopic particles such as atoms, molecules, and electrons.

Related publications (32)

Organometallics on Silicon - a Synchrotron-Radiation Photoemission-Study of the Adsorption of Iron Pentacarbonyl on Si(111) Surfaces with Different Reconstructions

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