Theory for High‐Angular‐Resolution Photoelectron Holograms Considering the Inelastic Mean Free Path and the Formation Mechanism of Quasi‐Kikuchi Band

Matsushita, Tomohiro; Matsuki, Takayuki; Yokoya, Takayoshi; Terashima, Kazuhiko; Kato, Y.; Matsui, H.; Maejima, Naoyuki; Hashimoto, Yusuke; Matsui, Fumihiko

doi:10.1002/pssb.202000117

Cited by 6 publications

(6 citation statements)

References 21 publications

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“…The main difference is the observed angular range, covering the full 2 solid angle for DIANA, and a momentum range of diameter ∼20 Å −1 for the ToF-MM, corresponding to a polar angular range of up to 0-15°, depending on kinetic energy. The relative angular resolution is comparable: 0.5°for DIANA 41) and 0.034°for the ToF-MM. 16) Principal limitations are posed by the lens aberrations, limiting the maximum accessible angular range for the ToF-MM and the micro-lens action of the grid meshes 42) for display-type analyzers.…”

Section: Introductionmentioning

confidence: 87%

Structure Analysis Using Time-of-Flight Momentum Microscopy with Hard X-rays: Status and Prospects

2022

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X-ray photoelectron diffraction (XPD) has developed into a powerful technique for the structural analysis of solids. Extension of the technique into the hard-X-ray range (hXPD) gives access to true bulk information. Here we give a status report on hXPD experiments using a novel full-field imaging technique: Time-of-flight momentum microscopy (ToF-MM). A special variant of ToF-MM is capable of recording high kinetic energies (up to >7 keV) and enlarged kfields-of-view. We present applications that are specific for high kinetic energies. The strong site specificity of hXPD is exemplified for NbSe 2 , the cubic-to-tetragonal transition in SrTiO 3 and the zinc-blende structure in epitaxial GaAs films. Bloch-wave calculations show a very good agreement with experiment and reveal fingerprint-like signatures of emitter sites in host lattices. We show a dopant-site analysis in two semiconductors (Mn in GaAs and Te in Si). Hard-X-ray ARPES plus core-level hXPD enable eliminating the strong diffraction signature imprinted in HARPES maps.

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Section: Introductionmentioning

confidence: 87%

Structure Analysis Using Time-of-Flight Momentum Microscopy with Hard X-rays: Status and Prospects

2022

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“…Thermal vibrations can be considered as atoms oscillating around their ideal positions with a Gaussian distribution with a standard deviation, , given as hu 2 i/6 = 2 /2. This introduces an additional term in the holographic oscillation (Matsushita, Muro, Yokoya et al, 2020),…”

Section: Hologram Pattern Simulationsmentioning

confidence: 99%

Development of serial X-ray fluorescence holography for radiation-sensitive protein crystals

Ang¹,

Umena²,

Sato‐Tomita³

et al. 2023

J Synchrotron Radiat

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X-ray fluorescence holography (XFH) is a powerful atomic resolution technique capable of directly imaging the local atomic structure around atoms of a target element within a material. Although it is theoretically possible to use XFH to study the local structures of metal clusters in large protein crystals, the experiment has proven difficult to perform, especially on radiation-sensitive proteins. Here, the development of serial X-ray fluorescence holography to allow the direct recording of hologram patterns before the onset of radiation damage is reported. By combining a 2D hybrid detector and the serial data collection used in serial protein crystallography, the X-ray fluorescence hologram can be directly recorded in a fraction of the measurement time needed for conventional XFH measurements. This approach was demonstrated by obtaining the Mn Kα hologram pattern from the protein crystal Photosystem II without any X-ray-induced reduction of the Mn clusters. Furthermore, a method to interpret the fluorescence patterns as real-space projections of the atoms surrounding the Mn emitters has been developed, where the surrounding atoms produce large dark dips along the emitter–scatterer bond directions. This new technique paves the way for future experiments on protein crystals that aim to clarify the local atomic structures of their functional metal clusters, and for other related XFH experiments such as valence-selective XFH or time-resolved XFH.

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“…as atomic holograms [234]; a refined theoretical treatment has been published very recently [235]. Since scattering cross sections are generally spin dependent, spinpolarised photoelectron diffraction can uncover the short-range magnetic order.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…For sake of conciseness we will only briefly mention further important aspects of photoelectron diffraction. High-quality photoelectron diffractograms can be considered as atomic holograms [233]; a refined theoretical treatment has been published very recently [234]. Since scattering cross sections are generally spin dependent, spin-polarised photoelectron c) and (i), (j) calculated fingerprint hXPD patterns for Mn atoms on tetrahedral (i) and hexagonal interstitial sites (j).…”

Section: Hard X-ray Photoelectron Diffraction (Hxpd)mentioning

confidence: 99%

Hard x-ray photoelectron spectroscopy: a snapshot of the state-of-the-art in 2020

Kalha

Fernando

Bhatt

et al. 2021

J. Phys.: Condens. Matter

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Hard X-ray photoelectron spectroscopy (HAXPES) is establishing itself as an essential technique for the characterisation of materials. The number of specialised photoelectron spectroscopy techniques making use of hard X-rays is steadily increasing and ever more complex experimental designs enable truly transformative insights into the chemical, electronic, magnetic, and structural nature of materials. This paper begins with a short historic perspective of HAXPES and spans from developments in the early days of photoelectron spectroscopy to provide an understanding of the origin and initial development of the technique to state-of-the-art instrumentation and experimental capabilities. The main motivation for and focus of this paper is to provide a picture of the technique in 2020, including a detailed overview of available experimental systems worldwide and insights into a range of specific measurement modi and approaches. We also aim to provide a glimpse into the future of the technique including possible developments and opportunities.

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Theory for High‐Angular‐Resolution Photoelectron Holograms Considering the Inelastic Mean Free Path and the Formation Mechanism of Quasi‐Kikuchi Band

Cited by 6 publications

References 21 publications

Structure Analysis Using Time-of-Flight Momentum Microscopy with Hard X-rays: Status and Prospects

Structure Analysis Using Time-of-Flight Momentum Microscopy with Hard X-rays: Status and Prospects

Development of serial X-ray fluorescence holography for radiation-sensitive protein crystals

Hard x-ray photoelectron spectroscopy: a snapshot of the state-of-the-art in 2020

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