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Emission Spectra02:39

Emission Spectra

79.0K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.8K
Molecular Orbital Theory II03:51

Molecular Orbital Theory II

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Molecular Orbital Energy Diagrams
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The de Broglie Wavelength02:32

The de Broglie Wavelength

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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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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

861
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
861
The Bohr Model02:18

The Bohr Model

84.0K
Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as the...
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関連する実験動画

Updated: Apr 11, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

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強い第2ハーモニー生成は,原子層のガセで発生する.

Xu Zhou, Jingxin Cheng1, Yubing Zhou

  • 1‡State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (MOE), Collaborative Innovation Center of Advanced Microstructures and Department of Physics, Fudan University, Shanghai 200433, China.

Journal of the American Chemical Society
|June 11, 2015
PubMed
まとめ
この要約は機械生成です。

研究者らは,ガリウムセレニド (GaSe) の原子層に強い光学第2ハーモニック生成 (SHG) を観測した. GaSeにおけるこの非線形光学効果は,二次元 (2D) 材料で報告されている中で最も強いものであり,その性質に関する新しい洞察を提供している.

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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Gradient Echo Quantum Memory in Warm Atomic Vapor

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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

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関連する実験動画

Last Updated: Apr 11, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
10:17

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

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Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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科学分野:

  • 材料科学 材料科学とは
  • 凝縮物質物理学 凝縮物質物理学
  • オプトエレクトロニクス (光電子機器)

背景:

  • 二次元 (2D) の原子層材料における非線形光学現象は,著しい注目を集めています.
  • 非線形光学エッジ応答とバレー/スピン電流を含むこれらの効果は,2D素材の潜在的アプリケーションを拡大します.
  • 新興の2D素材における新しい非線形効果の探求は,技術的進歩にとって極めて重要です.

研究 の 目的:

  • 単層ガリウムセレニド (GaSe) の強い光学第2ハーモニック生成 (SHG) の最初の観測を報告する.
  • GaSeの非線形光学特性を非共振刺激および放出条件下で調査する.
  • GaSe原子層の対称性と構造的特性を探査するためにSHGを使用する.

主な方法:

  • 単層と二層のGaSeにおける光学第2ハーモニック生成 (SHG) の実験的観測.
  • 波長1600 nmの非共振刺激および放射スペクトロスコーピー.
  • 極化に依存したSHG強度測定とSHGマッピング.
  • GaSe.で格子対称性と積み重ね順序 (AA,AB) の分析

主要な成果:

  • モノレイヤのGaSeは,非常に強い非共振SHGを示し,これまでに測定された他の2D原子結晶を上回ります.
  • モノレイヤのGaSeからのSHG信号は,同一の興奮力下でのMoS2からの信号よりも1〜2倍の大きさです.
  • モノレイヤのGaSeは,三重の格子対称性を示し,三角形と相関しています.
  • Bilayer GaSeは,異なる層に一致するエッジ構成で,支配的なAAとABのスタッキング順序を示しています.

結論:

  • GaSeは,現在研究されている2D原子結晶の中で最も強い非線形光学応答を有しています.
  • SHGは,GaSe原子層の構造と対称性の性質を調査するための強力なツールです.
  • この発見は,GaSeおよび同様の材料における他の非線形光学効果の探求に道を開く.