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: The 351 nm photoelectron spectra of the phenide, benzyl and phenoxide anions are reported in this paper. But the results are limited to the presence of two vibrational modes at 600(10) and 968(15) cm −1, and an excited electronic state at ⩽ 1.7 eV.
209 citations
TL;DR: In this paper, the chemical composition of surface oxides grown on InP was investigated using x-ray photoelectron spectroscopy, and it was shown that oxides can be classified into three groups which have properties similar to crystalline In(OH)3, InPO4, and In(PO3)3.
Abstract: The chemical composition of surface oxides grown on InP is investigated using x‐ray photoelectron spectroscopy. Native oxides prepared by various chemical treatments, anodic oxides, and thermal oxides are examined. Core level energies and intensities and valence band spectra are compared with data for standard compounds. In a first step we show that, depending on the preparation procedure, oxides can be classified into three groups which have properties similar to crystalline In(OH)3, InPO4, and In(PO3)3, respectively. The large variations observed in atomic compositions and the shape of valence band spectra suggest that the oxides could be amorphous nonstoichiometric phases. A description based on a mixture of well defined compounds (e.g., In2O3+P2O5 or In2O3+InPO4) seems to be inadequate. Chemical and anodic phosphorus‐rich oxides are identified as Inx(PO3)y polyphosphates.
209 citations
TL;DR: In this paper, a new type of CeO2 nanodevice was presented, in which a single CeO 2 nanowire was used as the sensing unit, and it was found that incorporation of Pt nanocrystals on the nanowires could significantly increase the sensor response.
Abstract: We present a new type of CeO2 nanodevice in which a single CeO2 nanowire was used as the sensing unit. It was found that incorporation of Pt nanocrystals on CeO2 nanowire could significantly increase the sensor response. A possible mechanism was discussed based on the study of morphology and surface bond states of the nanowire using local electron energy loss spectroscopy and X-ray photoemission spectroscopy. The results provide a pathway to improve the performance of gas sensors with a good understanding of the nanowire’s surface physics and chemistry.
208 citations
TL;DR: In this paper, the authors performed infrared reflectivity measurements to investigate the underlying physics of the ZrTe5 topological Dirac material and derived optical conductivity increases linearly with frequency below normal interband transitions, which provides optical spectroscopic proof of a 3D Dirac semimetal.
Abstract: Three-dimensional (3D) topological Dirac materials have been under intensive study recently. The layered compound ZrTe5 has been suggested to be one such material as a result of transport and angle-resolved photoemission spectroscopy experiments. Here, we perform infrared reflectivity measurements to investigate the underlying physics of this material. The derived optical conductivity increases linearly with frequency below normal interband transitions, which provides optical spectroscopic proof of a 3D Dirac semimetal. In addition, the plasma edge shifts dramatically to lower energy upon temperature cooling, which might be due to the shrinking of the lattice parameters. Additionally, an extremely sharp peak shows up in the frequency-dependent optical conductivity, indicating the presence of a Van Hove singularity in the joint density of state.
206 citations
TL;DR: It is argued that the high atomic polarizability of Se plays an important role to stabilize the excitonic state of Ta2NiSe5.
Abstract: We report on a photoemission study of ${\mathrm{Ta}}_{2}{\mathrm{NiSe}}_{5}$ that has a quasi-one-dimensional structure and an insulating ground state Ni $2p$ core-level spectra show that the Ni $3d$ subshell is partially occupied and the Ni $3d$ states are heavily hybridized with the Se $4p$ states In angle-resolved photoemission spectra, the valence-band top is found to be extremely flat, indicating that the ground state can be viewed as an excitonic insulator state between the Ni $3d$--Se $4p$ hole and the Ta $5d$ electron We argue that the high atomic polarizability of Se plays an important role to stabilize the excitonic state
206 citations