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関連する概念動画

Interference and Diffraction02:18

Interference and Diffraction

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Polar Equations of Conics01:29

Polar Equations of Conics

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A conic section can be defined in polar coordinates as the set of all points whose distance from a fixed point, known as the focus, bears a constant ratio to their distance from a fixed line, known as the directrix. This constant ratio is called the eccentricity. This definition unifies all types of conic sections—ellipses, parabolas, and hyperbolas—under a single framework. When the focus is positioned at the origin of the polar coordinate system, a single polar equation can...
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X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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Electron Carriers01:24

Electron Carriers

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Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
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Electron Affinity03:07

Electron Affinity

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The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
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Electron Behavior00:54

Electron Behavior

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Overview
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
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関連する実験動画

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Blood Flow Imaging with Ultrafast Doppler
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画像 CF3I 円交差点と超高速電子 difraktion で光解離ダイナミクス

Jie Yang1,2, Xiaolei Zhu2,3, Thomas J A Wolf2

  • 1SLAC National Accelerator Laboratory, Menlo Park, CA, USA. jieyang@slac.stanford.edu todd.martinez@stanford.edu martin.centurion@unl.edu wangxj@slac.stanford.edu.

Science (New York, N.Y.)
|July 7, 2018
PubMed
まとめ

超高速の電子微分法で 円の交差点にある分子波のパケットをイメージした. この研究では,CF3Iにおける核波パケットのバイフォケーションと振動モードを観察し,理論的な計算を検証した.

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Microcrystal Electron Diffraction of Small Molecules
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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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関連する実験動画

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科学分野:

  • 物理化学
  • 分子力学
  • 量子化学について

背景:

  • 円の交差点は,興奮状態の分子動力学と非アディアバティックなプロセスにとって極めて重要です.
  • 円形の交差点を通る波束の軌道を直接画像化することは,空間解像度の制限により困難でした.

研究 の 目的:

  • 単離されたCF3I分子における1フォトンと2フォトンの刺激チャネルを実験的に特徴づける.
  • 核波パケットのダイナミクスを,円の交差点を通して直接イメージする.

主な方法:

  • 超高速ガス相電子微分法 (UF-GED) を利用した.
  • 一フォトンと二フォトンの刺激経路を同時に研究した.
  • アブ・イニシア ノン・アディアバティック・ダイナミクスの計算を有効化するために適用した.

主要な成果:

  • 2フォトンのチャネルでコヒーレントな核波の軌道をマッピングした.
  • 波のパケットが2つの潜在エネルギー表面に二重に分けられ,円の交差点にある.
  • CF3断片の傘と呼吸の振動モードの刺激が,単光子チャンネルで複数の次元で解決された.

結論:

  • UF-GEDの超高速分子ダイナミクスを探査する能力を実証した.
  • 円の交差点での波のパケットの行動の直接的な実験的証拠を提供した.
  • 非アディアバティックな分子プロセスの理論モデルを検証した.