Topic
Photoemission spectroscopy
About: Photoemission spectroscopy is a research topic. Over the lifetime, 10821 publications have been published within this topic receiving 250888 citations. The topic is also known as: photoelectron spectroscopy & PES.
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TL;DR: In this article, surface core-level shifts measured using photoemission with synchrotron radiation are reviewed for a variety of transition metals (Ta, W, Ir), rare earth metals (Yb, Sm, Gd, YbAl2), noble metals (Au), and semiconductors (Si, Ge, GaAs).
Abstract: Surface core‐level shifts measured using photoemission with synchrotron radiation are reviewed for a variety of transition metals (Ta, W, Ir), rare earth metals (Yb, Sm, Gd, YbAl2), noble metals (Au), and semiconductors (Si, Ge, GaAs). Models of surface shifts are discussed, including the relationships of surface shifts to surface crystallography, reconstruction, valence electron configuration, surface cohesive energy, etc. Applications of surface shifts which are described include surface reconstruction on metals and semiconductors and high‐resolution chemisorption studies.
86 citations
TL;DR: In this paper, the authors used ultraviolet photoemission spectroscopy (UPS) and LEED/Auger to study adsorbed species of C, N, O, S, CO, NO, and C2H2 on Fe(110).
Abstract: Ultraviolet photoemission spectroscopy (UPS) and LEED/Auger were used to study adsorbed species of C, N, O, S, CO, NO, and C2H2 on Fe(110). The complicated “carbon ring” LEED patterns were shown to be due to atomic carbon and/or nitrogen. Molecular nitrogen does not stick at or above room temperature on Fe(110). The optical excitation probability of the 3p electrons of segregated sulphur is found to have a Cooper minimum aroundhω=40.8 eV. Carbon monoxide chemisorbs molecularly at room temperature and then dissociates slowly. Only dissociative CO adsorption was observed atT=385 K. Acetylene also adsorbs molecularly but does not dissociate at room temperature. By contrast, nitric oxide chemisorption is completely dissociative at room temperature.
86 citations
86 citations
TL;DR: It was found that silicon surface engineering can be accomplished by the electrochemical grafting process using nitrobenzene and bromobenzene: silicon-derived interface gap states are chemically passivated, and the adsorbate-related surface dipole effects an increase of the electron affinity.
Abstract: The properties of Si(111) surfaces grafted with benzene derivatives were investigated using ultraviolet photoemission spectroscopy (UPS) and X-ray photoelectron spectroscopy (XPS). The investigated materials were nitro-, bromo-, and methoxybenzene layers (−C6H4−X, with X = NO2, Br, O−CH3) deposited from diazonium salt solutions in a potentiostatic electrochemical process. The UPS spectra of the valence band region are governed by the molecular orbital density of states of the adsorbates, which is modified from the isolated state in the gas phase due to molecule−molecule and molecule−substrate interaction. Depending on the adsorbate, clearly different emission features are observed. The analysis of XPS intensities clearly proves multilayer formation for bromo- and nitrobenzene in agreement with the amount of charge transferred during the grafting process. Methoxybenzene forms only a sub-monolayer coverage. The detailed analysis of binding energy shifts of the XPS emissions for determining the band bending ...
86 citations
TL;DR: In this paper, the photoelectron spectrum of HCP has been obtained, ionization potentials are found at 10.79 ± 0.01 eV (X 2 Π) and 12.86 ± ε (A 2 Σ).
86 citations