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, the chemisorption and decomposition of methanol (CH3OH) on Ni(111) has been studied by ultraviolet photoemission spectroscopy (UPS) and flashdeposition mass spectrographs.
Abstract: The chemisorption and decomposition of methanol (CH3OH) on Ni(111) has been studied by ultraviolet photoemission spectroscopy (UPS) and flash‐deposition mass spectroscopy. The UPS spectra suggest that exposure at ∠80 K produces chemisorbed CH3OH in which the chemisorption interaction affects two molecular orbitals, the oxygen lone‐pair oriented perpendicular to the COH plane and an in‐plane orbital having mixed lone‐pair and σ‐bonding character. Upon warming to ∠160 K, some CH3OH desorption occurs and the UPS spectrum changes markedly. Further warming to ∠300 K produces H2 desorption and leaves chemisorbed CO as the final decomposition product on the surface.
109 citations
TL;DR: In this paper, the authors reported the observation and systematic investigation of the space charge effect and mirror charge effect in photoemission spectroscopy, and showed that these combined Coulomb interaction effects give rise to an energy shift and a broadening which can be on the order of 10 meV for a typical third-generation synchrotron light source.
109 citations
TL;DR: In this paper, the Au-on-F16CuPc interface exhibits a lower hole injection barrier than the F16cuPc-on Au interface, attributed to the diffusion of Au into the organic matrix at the Auon-top interface, in which they behave as acceptors.
Abstract: Interfaces formed by evaporating Au on copper hexadecafluorophthalocyanine (F16CuPc) and F16CuPc on Au are studied via ultraviolet photoemission spectroscopy and x-ray photoemission spectroscopy. The energy position of the molecular levels is found to depend on the deposition sequence. The Au-on-F16CuPc interface exhibits a lower hole injection barrier than the F16CuPc-on-Au interface. This behavior is attributed to the diffusion of Au into the organic matrix at the Au-on-top interface, in which they behave as acceptors. Band bending consistent with p doping, i.e., upward away from the metal interface, is observed in Au-doped F16CuPc films. Current–voltage measurements on Au/F16CuPc/Au sandwich structures show a higher electron injection barrier at the top Au electrode contact than at the bottom electrode contact, also consistent with p-type doping F16CuPc by Au.
109 citations
TL;DR: It is found that photospectral time dependence distinguishes between direct and stepwise ionization routes for the inner electron in a three-body quantum system analogous to a negative ion.
Abstract: The strong-field behavior of a three-body quantum system analogous to a negative ion has been investigated by solving Schr\"odinger's equation nonperturbatively for two electrons on a two-dimensional lattice. Both photodetachment and core ionization have been studied, and we find that photospectral time dependence distinguishes between direct and stepwise ionization routes for the inner electron.
109 citations
TL;DR: The network topology of the model is analyzed through partial pair correlations, angle distributions, partial static structure factors, and ring structures, and the localization of the electronic states is analyzed.
Abstract: We present results of an ab initio molecular-dynamics study of glassy ${\mathrm{GeSe}}_{2}$ using a 216 atom model. The network topology of our model is analyzed through partial pair correlations, angle distributions, partial static structure factors, and ring structures. The total static structure factor and first sharp diffraction peak are in good agreement with experiment. The vibrational density of states and dynamical structure factor are in good agreement with experimental results as well. We have visualized the normal modes vectors in order to qualitatively understand their motion. The electronic density of states compares very well with experimental ultraviolet photoemission spectroscopy and x-ray photoemission spectroscopy measurements. The localization of the electronic states is analyzed. \textcopyright{} 1996 The American Physical Society.
108 citations