Construction of two-dimensional photoelectron spectrometer at SPring-8

Kotsugi, Masato; Miyatake, Y.; Enomoto, Kazuki; Fukumoto, Keiki; Kobayashi, Atsushi; Nakatani, Takeshi; Saitoh, Y.; Matsushita, Tomohiro; Imada, S.; Furuhata, T.; Suga, S.; Soda, Kazuo; Jinno, Masafumi; Hirano, Takahide; Hattori, Ken; Daimon, Hiroshi

doi:10.1016/s0168-9002(01)00733-1

Cited by 54 publications

(15 citation statements)

References 11 publications

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“…The graphite single crystal was cleaved and degassed in an ultrahigh vacuum chamber. The C 1s PIAD patterns from the graphite crystal surface were measured using DIANA 3,6 at the circularly polarized soft X-ray beamline BL25SU of SPring-8, Japan. [7][8][9] The details of PIAD data processing are described elsewhere.…”

Section: Experimental Methodsmentioning

confidence: 99%

Mapping nanometer and micrometer‐scale structures at graphite surface by photoelectron diffraction

Fujita

Ōta

Matsushita

et al. 2018

Surface & Interface Analysis

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A series of C 1s photoelectron intensity angular distribution (PIAD) patterns from a crystalline graphite surface were mapped in two dimensions at intervals of 20 μm. Two kinds of PIAD patterns rotated by 30° from each other, corresponding to the two domains from the twinned crystal, were found. The standard deviation of the diffraction contrast was evaluated for each PIAD pattern from its intensity histogram. Surprisingly, we found that odd‐number‐ (most probably single‐) atom‐height steps on the flat terrace region and their local atomic arrangement can be identified by two‐dimensionally mapping the standard deviation values. Furthermore, we analyzed the photoelectron diffraction patterns and noticed that the normal direction of the sample surface at each point was slightly inclined differently. By connecting all the inclination angle data, the micrometer‐scale corrugation of the sample surface was successfully visualized. Scanning photoelectron diffraction microscopy has been shown to be useful for the nanometer‐ and micrometer‐scale structural imaging.

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Section: Experimental Methodsmentioning

confidence: 99%

Mapping nanometer and micrometer‐scale structures at graphite surface by photoelectron diffraction

Fujita

Ōta

Matsushita

et al. 2018

Surface & Interface Analysis

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“…PIAD from the sample at a specific kinetic energy was most efficiently measured using a two-dimensional display-type spherical mirror analyzer (DIANA) which was installed at the circularly-polarized soft x-ray beamline BL25SU at SPring-8 in Japan [11]. A 2π-steradian PIAD was obtained by scanning of the sample azimuth for 360 • .…”

Section: Methodsmentioning

confidence: 99%

Atomic Structure and Catalytic Activity of W-Modified Ni<sub>2</sub>P Surface Alloy by Photoelectron Diffraction and Spectroscopy

Matsui

Maejima

et al. 2014

e-J. Surf. Sci. Nanotechnol.

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The surface alloying is the important topics in Ni2P study which is expected for next generation hydrodesulfurization and hydrodenitrogenation catalyst. The atomic structure and catalytic properties of a single crystalline Ni2P surface modified with W (W-Ni2P) was investigated by photoelectron diffraction (PED) and spectroscopy. PED is an element and site selective surface structure analysis method that enables observation of three-dimensional atomic configurations of the surface local structure. The selective replacement of W to the Ni site in the Ni2P crystal was clarified by PED. Chemical reactivities for NO molecules of the W-Ni2P and the clean Ni2P surfaces were compared. On the clean Ni2P surface, the NO adsorption did not occur, whereas W-Ni2P surface showed remarkable activity for NO adsorption.

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“…Subsequently, it was annealed up to 500 C in an ultrahigh-vacuum condition for degassing. C 1s PD patterns were measured using a two-dimensional display-type spherical mirror analyzer (DIANA) 57,58) at the circularly polarized soft X-ray beamline BL25SU of SPring-8, Japan. 59) The helicity ( AE1 ) of monochromatized circularly polarized soft X-rays was reversed by switching the path of storage ring electrons in twin helical undulators at 0.1 Hz.…”

Section: Methodsmentioning

confidence: 99%

Photoelectron Diffraction and Holographic Reconstruction of Graphite

2012

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A series of two-dimensional photoelectron angular distributions from a graphite single crystal for different kinetic energies from 311 to 908 eV using circularly polarized soft X-ray was measured. We realized that the directions of the prominent peaks arranged in a hexagon appearing in the photoelectron diffraction patterns and the directions from a photoelectron emitter atom to the surrounding atoms, which we previously assigned as the corresponding scatterer atoms [Appl. Phys. Lett. 85 (2004) 3737], do not match. From the comparison of the photoelectron diffraction patterns with multiple scattering calculations for each atomic site, we corrected our earlier assignments and revealed that the signatures of such peaks are even found in the photoelectron diffraction pattern of monolayer graphene. In the case of graphite that has a large interlayer separation, the diffraction rings due to in-plane scattering become dominant over the forward focusing peaks owing to interlayer scattering. Furthermore, a holographic reconstruction algorithm based on the fitting of elemental diffraction patterns for various C-C bond distances was used to analyze the full set of measured data. Clear nanometer-scale real-space images of several graphite layers were reconstructed.

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Construction of two-dimensional photoelectron spectrometer at SPring-8

Cited by 54 publications

References 11 publications

Mapping nanometer and micrometer‐scale structures at graphite surface by photoelectron diffraction

Mapping nanometer and micrometer‐scale structures at graphite surface by photoelectron diffraction

Atomic Structure and Catalytic Activity of W-Modified Ni<sub>2</sub>P Surface Alloy by Photoelectron Diffraction and Spectroscopy

Photoelectron Diffraction and Holographic Reconstruction of Graphite

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