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関連する概念動画

Atomic Structure01:33

Atomic Structure

All matter is composed of atoms, the smallest individual units of elements. Each atom is made up of three subatomic particles: protons, neutrons, and electrons. Together, these three particles account for the mass and the charge of an atom.The History of Atomic TheoryThe first person to propose that everything on Earth is made up of tiny particles was the Greek philosopher Democritus, around 450 B.C. He used the term atomos, Greek for “indivisible,” from which the modern term “atom” is derived.
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Electronic Structure of Atoms02:28

Electronic Structure of Atoms


An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum numbers:  n, l, ml, and...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
Atomic Structure01:17

Atomic Structure

The Greek philosopher Democritus proposed that everything on Earth is made up of tiny particles called atomos, Greek for "indivisible," from which the modern term "atom" is derived. In the 19th century, John Dalton proposed the atomic theory that is still largely correct today. He put forth five postulates to explain how atoms made up the world around us. (1) All matter is composed of infinitely small particles or atoms. (2) All atoms of a given element are identical to one another and (3) are...

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関連する実験動画

Updated: Jul 9, 2026

An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation
11:20

An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation

Published on: August 30, 2017

エンジニアリングされたCoCunナノ構造体における電子的に誘導された原子運動.

Joseph A Stroscio1, Francesca Tavazza, Jason N Crain

  • 1Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899-8412, USA. joseph.stroscio@nist.gov

Science (New York, N.Y.)
|August 19, 2006
PubMed
まとめ
この要約は機械生成です。

私たちは,電子によって刺激されたとき,CoCu分子内の単一のコバルト (Co) 原子が動く確率を測定しました. 原子の運動は分子が長くなるにつれて減少し,電子構造の変化と相関する.

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A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton
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A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton

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Picometer-Precision Atomic Position Tracking through Electron Microscopy
15:04

Picometer-Precision Atomic Position Tracking through Electron Microscopy

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関連する実験動画

Last Updated: Jul 9, 2026

An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation
11:20

An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation

Published on: August 30, 2017

A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton
05:47

A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton

Published on: July 29, 2018

Picometer-Precision Atomic Position Tracking through Electron Microscopy
15:04

Picometer-Precision Atomic Position Tracking through Electron Microscopy

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科学分野:

  • 表面科学とは,地表科学である.
  • 原子操作による原子操作.
  • 量子化学とは,量子化学である.

背景:

  • 表面の原子ダイナミクスを理解することは,材料科学にとって極めて重要です.
  • CoCu(n) 線形分子は,原子相互作用を研究するためのモデルシステムとして機能する.
  • スキャントンネル顕微鏡 (STM) は,原子レベルの操作と観察を可能にします.

研究 の 目的:

  • CoCu (n) 分子の内の単一の Co 原子における誘導運動の量子産出量を定量化する.
  • 電子構造と原子の移動性の関係を調査する.
  • 原子の動力学に対する分子長さの影響を調査する.

主な方法:

  • Cu111) 表面上の CoCu (n) 線形分子を作製する.
  • スキャントンネル顕微鏡 (STM) を使用して,電子刺激と原子操作を行う.
  • 活性状態を特定するために電子構造の計算を行う.

主要な成果:

  • CoCu (n) 分子の CoCu (n) 原子運動を刺激する量子力学を測定した.
  • 観測されたコア原子は,電子の刺激によって2つの格子位置の間を切り替える.
  • 運動を誘発するための最も可能性の高い先端位置と,計算されたアクティブ状態の位置を相関させた.
  • 原子の運動が分子長さを増すにつれて減少することを発見した.

結論:

  • 原子運動の量子収量には,分子内のCo原子の電子構造が直接影響する.
  • 分子の長さは,原子の移動性と電子特性を調節する上で重要な役割を果たします.
  • STM誘発の電子刺激は,原子ダイナミクスの探査と制御のための効果的な方法です.