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X-ray Crystallography02:18

X-ray Crystallography

24.5K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
24.5K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

45.3K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
45.3K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.4K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.4K
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

991
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
991
Structures of Solids02:22

Structures of Solids

16.0K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
16.0K
The de Broglie Wavelength02:32

The de Broglie Wavelength

30.6K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Assessing Two-dimensional Crystallization Trials of Small Membrane Proteins for Structural Biology Studies by Electron Crystallography
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Assessing Two-dimensional Crystallization Trials of Small Membrane Proteins for Structural Biology Studies by Electron Crystallography

Published on: October 29, 2010

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二次元の一般化されたウィグナー結晶のイメージング

Hongyuan Li1,2,3, Shaowei Li4,5,6,7, Emma C Regan1,2,3

  • 1Department of Physics, University of California at Berkeley, Berkeley, CA, USA.

Nature
|September 30, 2021
PubMed
まとめ
この要約は機械生成です。

物理学者は,WSe2/WS2モアールヘテロ構造の二次元 (2D) ウィーナー結晶を直接可視化している. 新しい非侵襲的なスキャニングトンネル顕微鏡 (STM) 技術は,断片的な電子埋着で明確な格子構成を明らかにしました.

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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

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Last Updated: Oct 18, 2025

Assessing Two-dimensional Crystallization Trials of Small Membrane Proteins for Structural Biology Studies by Electron Crystallography
09:23

Assessing Two-dimensional Crystallization Trials of Small Membrane Proteins for Structural Biology Studies by Electron Crystallography

Published on: October 29, 2010

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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • 量子力学について

背景:

  • 90年前に理論化された ヴィーナー結晶は 奇妙な電子状態です
  • 以前の観測は間接的だったか 現実空間での視覚化が欠けていた
  • 2Dウィーナー結晶は以前,2D電子ガスやモアール超網で見られた.

研究 の 目的:

  • 2次元ウィーナー結晶の直接的なリアル空間イメージングを実現します.
  • 従来のスキャニングトンネル顕微鏡 (STM) の限界を克服する.
  • WSe2/WS2のモアールヘテロ構造のウィーナー結晶状態を調査する.

主な方法:

  • グラフェンセンシング層を用いた非侵襲的なSTMスペクトロスコピーの技術を開発した.
  • ローカル STM トンネル電流の調節をウィナー結晶格子によって利用した.
  • この技術を WSe2/WS2 モイレの異質構造に適用した.

主要な成果:

  • 2次元ウィーグナー結晶を現実空間で 視覚化しました
  • 断片的な電子埋着 (n = 1/3, 1/2, 2/3) の際,明確な格子構成が観察されました.
  • 特定された三角形 (n=1/3),ハネコム (n=2/3),およびストライプ (n=1/2) 段階で,n=1/2状態はC3対称性を破ります.

結論:

  • この研究は,WSe2/WS2モアールヘテロ構造における2Dウィーガー結晶の最初の直接のリアルスペースイメージングを提供します.
  • 非侵襲的なSTM技術は,脆弱な相関電子状態を研究するための強力なツールです.
  • このアプローチは,他の量子材料で新しい電子格子をイメージするために一般化することができます.