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関連する概念動画

UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

3.0K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
3.0K
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

3.1K
Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
3.1K
Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

3.2K
Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...
3.2K
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

1.8K
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
1.8K
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

3.0K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
3.0K
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

1.1K
Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
1.1K

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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

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凝縮物質におけるアット秒スペクトロスコピー

A L Cavalieri1, N Müller, Th Uphues

  • 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany. adrian.cavalieri@mpq.mpg.de

Nature
|October 26, 2007
PubMed
まとめ

研究者らは,アット秒テクニックを用いて,固体における電子ダイナミクスを観察した. 彼らは,光電子放出の100アット秒遅延を測定し,凝縮物質の電荷ダイナミクスに関する洞察を明らかにしました.

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • アットセカンド・サイエンス
  • 量子エレクトロニクスとは

背景:

  • 電子ダイナミクスを理解することは,半導体や光伏などの先進技術にとって極めて重要です.
  • アット秒 (10−18秒) のスケールで発生する超高速の電子プロセスの探査は,依然として重要な課題です.
  • 原子の運動はフェムト秒の時間尺度で観測できるが,電子のダイナミクスにはさらに高い解像度が必要である.

研究 の 目的:

  • 凝縮物質のシステムや表面における電子の動きをリアルタイムで観測するためのアット秒技術を拡張する.
  • アットセカンドの解像度で充電ダイナミクスへの直接のタイムドメインアクセスを達成します.
  • 固体における基本的な電子プロセスを調査する.

主な方法:

  • 以前に孤立した原子に用いられていたアト秒技術が,凝縮された物質のシステムに適用される.
  • 単結晶のボルンガムから発する光電子の放射を検知する.
  • 電子ダイナミクスのリアルタイム観測は,アット秒解像度を用いて行われます.

主要な成果:

  • アット秒解像度で充電ダイナミクスへの直接タイムドメインアクセスが実証されています.
  • コアと伝導帯状から発する光電子の放出の間に約100アト秒の遅延が観察されました.
  • アット秒時間スケールにおける凝縮物質における電子ダイナミクスの実験的証拠を提供した.

結論:

  • アット秒メトロロジーは,凝縮物質システムや表面における電子ダイナミクスを研究するための強力なツールです.
  • 観測された遅延は,電子の局所状態と局外状態の振る舞いの違いを強調しています.
  • この研究は,固体における基本的な電子プロセスの探求のための新しい道を開く.