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関連する概念動画

Stereoisomerism02:52

Stereoisomerism

11.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.1K
Stereoisomers02:32

Stereoisomers

14.0K
On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to...
14.0K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.7K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.7K
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

9.4K
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
9.4K
Poisson's Ratio01:23

Poisson's Ratio

2.3K
Poisson's ratio is a material property that indicates their stress response. It explains the connection between the elongation or compression a material undergoes in the direction of an applied force and the contraction or expansion it experiences perpendicular to that force. When a slender bar is loaded axially, it stretches in the direction of the force and contracts laterally. Poisson's ratio is the negative ratio of this lateral contraction to the axial elongation. The negative sign...
2.3K
Fineness Modulus01:19

Fineness Modulus

2.0K
The fineness modulus (FM) of aggregate is a numerical index that measures the coarseness or fineness of the particles. It is calculated by adding the cumulative percentages of aggregate retained on each of a specified series of sieves and dividing the sum by 100.
Consider performing sieve analysis on sand through a set of ASTM sieves. The weight of aggregate retained in each sieve and pan placed at the bottom is recorded, as given in Column B of Table 1.
To determine the fineness modulus of...
2.0K

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関連する実験動画

Updated: May 3, 2026

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
11:14

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Published on: May 28, 2016

14.0K

シリコンにおける受容波関数アニゾトロピーのイメージング

Manuel Siegl1,2, Julian Zanon3, Joseph Sink4

  • 1London Centre for Nanotechnology, University College London, London WC1H 0AH, U.K.

Nano letters
|August 21, 2025
PubMed
まとめ
この要約は機械生成です。

研究者は水素受容器の波動関数の 最初のスキャニングトンネル顕微鏡画像を シリコンで撮影しました シリコンベースの量子装置の開発に不可欠な 方形リングの特徴を明らかにしています

キーワード:
受け入れ国効果質量理論量子デバイスエンジニアリングスキャントンネル顕微鏡シリコン緊密な結合 グリーンの機能

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

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関連する実験動画

Last Updated: May 3, 2026

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
11:14

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Published on: May 28, 2016

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

Published on: April 1, 2020

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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • 量子コンピューティング

背景:

  • シリコンの受容体状態を理解することは,半導体装置の製造に不可欠です.
  • これまでの画像技術では これらの波関数の空間的特性を解明できませんでした
  • 欠陥はシリコンの電子特性を大きく変えます

研究 の 目的:

  • スキャントンネル顕微鏡 (STM) を使用して,水素受容器の波動関数の最初の直接画像を取得する.
  • これらの受容状態の空間的分布と対称性を特徴づける.
  • 先進的なシリコンベースの量子装置の設計のための基礎を提供するために.

主な方法:

  • シリコン (001) ウェファーの表面付近の欠陥を生成する高エネルギービスムートインプラント.
  • スキャントンネル顕微鏡 (STM) による原子スケールのイメージング.
  • 表面の電子特性を確認するためのスキャニングトンネルスペクトル検査 (STS).
  • 分析のための有効質量と緊固結合の理論的計算.

主要な成果:

  • シリコンにおける水素受容波関数の最初のSTM画像が得られた.
  • 観察された受容体状態は,異なる正方形のリングのような特徴として提示される.
  • STSは,p型表面層の形成を確認しました.
  • 理論的な計算は正方形のリングの特徴を正確に再現し,その受容体の性質を確認した.

結論:

  • 観測された正方形環の特徴は,シリコンの軽重孔帯の退化に起因する.
  • この研究は,受容波の空間的およびエネルギー的性質に関する重要な洞察を提供します.
  • この研究は,シリコンで大規模な受容器ベースの量子装置の将来の設計に不可欠です.