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関連する概念動画

Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
X-ray Imaging01:24

X-ray Imaging

German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...

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関連する実験動画

Updated: Jul 7, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

原子解像度でフォノン興奮をイメージする.

H Gawronski1, M Mehlhorn, K Morgenstern

  • 1Institute of Solid State Physics, Department of Surface Science, Leibniz University Hannover, Appelstrasse 2, D-30167 Hannover, Germany. gawronski@fkp.uni-hannover.de

Science (New York, N.Y.)
|February 16, 2008
PubMed
まとめ

低温不弾性電子トンネリングスペクトロスコーピーは,金と銅の表面フォノンを明らかにしました. 金面のフォノンエネルギーは,原子間隔に敏感であり,堆積ではなく,振動の原子解像度マッピングによって振動に敏感です.

科学分野:

  • 表面科学とは,地表科学である.
  • 凝縮物質物理学 凝縮物質物理学
  • スペクトル顕微鏡検査です.

背景:

  • 表面の振動を理解することは,触媒,表面反応,およびナノスケール電子機器にとって非常に重要です.
  • 不弾性電子トンネリング光譜法 (IETS) は,表面の振動モードを検知するための強力な技術です.
  • 以前の研究では,表面フォノンを調査しましたが,原子解像度のマッピングは依然として困難です.

研究 の 目的:

  • 低温IETSを用いて,Au{111}とCu{111}の表面フォノンについて調査する.
  • Au上の表面フォノンエネルギーに影響を与える要因を決定する 111).
  • フォノン刺激の原子解像度画像の達成と解釈.

主な方法:

  • 低温不弾性電子トンネリングスペクトロスコーピー (IETS) は,Au(111) とCu(111) の表面で実施されました.
  • 低エネルギー振動モードを解明するために,冷凍温度で測定を行った.
  • フォノン刺激の空間マッピングは,原子解像度を提供するIETSを使用して達成されました.

主要な成果:

  • 表面フォノンに起因する明確な低エネルギーピークは,Au{111}の9 meV,Cu{111}の21 meVで観察されました.

さらに関連する動画

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

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

Picometer-Precision Atomic Position Tracking through Electron Microscopy

Published on: July 3, 2021

関連する実験動画

Last Updated: Jul 7, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

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

Picometer-Precision Atomic Position Tracking through Electron Microscopy

Published on: July 3, 2021

  • Au{111}では,表面フォノンエネルギーは平面内の原子距離に依存するが,表面原子の積み重ねには依存しないことが判明した.
  • Au ((111) のIETSマップは原子解像度を示し,特定の原子部位とのフォノン興奮確率を相関させた.

    • 結論:

    • 高貴金属の表面上の表面フォノンは,低温IETSを使用して原子解像度で調査することができます.
    • 表面層内の原子距離は,Au上の表面フォノンエネルギーの重要な決定因子である.
    • IETSで観測された原子解像度は,場所固有のフォノン興奮確率で説明されます.