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 electronic energy level evolution of fullerene (C 60 ) on molybdenum oxide (MoO x )/conducting indium tin oxide (ITO) interfaces has been investigated with ultra-violet photoemission spectroscopy (UPS), inverse photo-emission spectrum (IPES) and atomic force microscopy (AFM).
72 citations
TL;DR: By selecting various vibronic levels of the intermediate state in resonant two-photon ionization, different vibrational distributions are observed in the resulting photoelectron spectrum as discussed by the authors, including the observation of non-totally symmetric modes.
72 citations
TL;DR: The electronic structure of high Tc Bi2Sr2CaCu2O8 single crystals in the vicinity of the Fermi level EF was determined down to about 0.7Tc by high-resolution angle-resolved photoemission spectroscopy applying HeI and synchrotron radiation as discussed by the authors.
Abstract: The electronic structure of high-Tc Bi2Sr2CaCu2O8 single crystals in the vicinity of the Fermi level EF is determined down to about 0.7Tc by high-resolution angle-resolved photoemission spectroscopy applying HeI and synchrotron radiation. Spectra taken with 18 eV photon energy at an emission angle of 9° reveal a clear Fermi edge T > Tc. For T < Tc the emission intensity changes distinctly—at EF it decreases whereas it increases at about 100 meV below EF—accompanied by a clear shift of the emission onset to higher binding energy. These observations can be consistently explained by the opening of an energy gap of about 30 meV in the superconducting quasi-particle density of states, yielding a ratio Δ (0)/kB Tc about twice as large as the BCS value indicating that Bi2Sr2CaCu2O8 is a strong-coupling superconductor.
72 citations
TL;DR: In this paper, a new scheme for the detection of ions produced by delayed pulsed field ionization of long-lived high-n Rydberg states (ZEKE Ryd Berg states) is presented.
Abstract: A new scheme for the detection of ions produced by delayed pulsed field ionization of long‐lived high‐n Rydberg states (ZEKE Rydberg states) is presented. The equivalence of this new ion detection scheme with high resolution zero kinetic energy photoelectron (ZEKE) spectroscopy is proven by the simultaneous measurement of electrons and ions originating from the same ZEKE Rydberg states, taking into account the effects of pulsed and static low electric fields on the ZEKE Rydberg states. Using this ion detection, a rotationally resolved mass analyzed threshold ionization (MATI) spectrum of benzene with the same resolution (the rotational structure of the benzene cation) as the simultaneously recorded ZEKE photoelectron spectrum has been obtained.
72 citations
TL;DR: It is found that the highest occupied molecular orbital of the methoxy species is much closer to the valence band maximum, suggesting why it is more photocatalytically active than the methanol molecule.
Abstract: Photocatalytic activity depends on the optimal alignment of electronic levels at the molecule–semiconductor interface. Establishing the level alignment experimentally is complicated by the uncertain chemical identity of the surface species. We address the assignment of the occupied and empty electronic levels for the prototypical photocatalytic system consisting of methanol on a rutile TiO2(110) surface. Using many-body quasiparticle (QP) techniques, we show that the frontier levels measured in UV photoelectron and two-photon photoemission spectroscopy experiments can be assigned to molecularly chemisorbed methanol rather than its dissociated product, the methoxy species. We find that the highest occupied molecular orbital of the methoxy species is much closer to the valence band maximum, suggesting why it is more photocatalytically active than the methanol molecule. We develop a general semiquantitative model for predicting many-body QP energies based on the electronic screening within the bulk, molecula...
72 citations