Topic
Chemisorption
About: Chemisorption is a research topic. Over the lifetime, 16298 publications have been published within this topic receiving 554989 citations.
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TL;DR: In this paper, the authors used low-energy electron diffraction to define the structure and the growth mechanism of the adsorbed layers of two-dimensional compounds, based on the mean distance between atoms.
177 citations
TL;DR: In this paper, the Langmuir adsorption isotherm and is a function of pH only; the saturation value is constant up to 170° and the equilibrium constants and heats of protonation are estimated.
177 citations
TL;DR: Two distinct adsorption wells—chemisorbed and precursor state separated by an entropy barrier—explain the anomalously high prefactors often observed in desorption of molecules from metals.
Abstract: We used the Linac Coherent Light Source free-electron x-ray laser to probe the electronic structure of CO molecules as their chemisorption state on Ru(0001) changes upon exciting the substrate by using a femtosecond optical laser pulse. We observed electronic structure changes that are consistent with a weakening of the CO interaction with the substrate but without notable desorption. A large fraction of the molecules (30%) was trapped in a transient precursor state that would precede desorption. We calculated the free energy of the molecule as a function of the desorption reaction coordinate using density functional theory, including van der Waals interactions. Two distinct adsorption wells—chemisorbed and precursor state separated by an entropy barrier—explain the anomalously high prefactors often observed in desorption of molecules from metals.
176 citations
TL;DR: In this article, photoemission techniques with synchrotron radiation were used to study the adsorption of oxygen on the Si(111)•(7×7) and Si(100)−(2×1) surfaces at room temperature in the submonolayer and monolayer regimes.
Abstract: We have used photoemission techniques with synchrotron radiation to study the adsorption of oxygen on the Si(111)‐(7×7) and Si(100)‐(2×1) surfaces at room temperature in the submonolayer and monolayer regimes. High resolution Si 2p core‐level spectra, valence‐band spectra, work‐function, and Fermi‐level pinning positions have been measured for exposures between 1 and 1000 L and after annealing at 700 °C. Four oxidation states have been detected for the silicon surface atoms with Si 2p core‐level shifts of 0.9, 1.9, 2.6, and 3.4 eV which are assigned to silicon atoms bonded to 1, 2, 3, and 4 oxygen atoms. Both (111) and (100) surfaces are characterized by about the same sticking coefficient, a simple adsorption process for 1‐L exposures, the quenching of the surface states after 15 L and a saturation of the amount of oxygen after 100 L. Significant differences exist in the initial bonding geometries for the (111) and (100) surfaces. After 15‐L exposure, oxygen atoms are incorporated below the Si (111)‐(7×7...
176 citations
TL;DR: In this article, the adsorption behavior of Congo red (CR) from aqueous solution onto the as-prepared polyhedral cuprous oxide nanoparticles (Cu2O NPs) was systematically investigated.
176 citations