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Atomic Orbitals02:44

Atomic Orbitals

An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
VSEPR Theory and the Basic Shapes02:52

VSEPR Theory and the Basic Shapes

Overview of VSEPR Theory
VSEPR Theory02:37

VSEPR Theory

Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
First Law: Particles in One-dimensional Equilibrium01:10

First Law: Particles in One-dimensional Equilibrium

Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If we...
First Law: Particles in Two-dimensional Equilibrium01:18

First Law: Particles in Two-dimensional Equilibrium

Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about the...

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可視範囲のプラズモニクスのための二次元ボロンポリモルフ:第一原理の探求

Yuefei Huang1, Sharmila N Shirodkar1, Boris I Yakobson1

  • 1Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.

Journal of the American Chemical Society
|November 2, 2017
PubMed
まとめ
この要約は機械生成です。

ボロフェンは新しい2D材料で,高い電子濃度によりユニークなプラズモニック特性を示しています. これらのプラズモンは,ドーピングを必要とせずに,可視スペクトルでも高い周波数で動作します.

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科学分野:

  • 材料科学
  • 凝縮物質物理学
  • ナノテクノロジー

背景:

  • 二次元 (2D) 材料はユニークな電子特性を提供します.
  • ボロフェンは,最近発見された2Dボロンアロトロップで,金属の特徴を示しています.
  • ボロフェンの高い自由電荷キャリア濃度は,プラズモンの行動の可能性を示唆する.

研究 の 目的:

  • ボロフェンのプラズモニック特性を調べるため
  • ボロフェン構造におけるプラズモンの周波数と分散関係を計算する.
  • ナノプラズモンの応用におけるボロフェンの可能性を調査する.

主な方法:

  • ダイエレクトリック関数の Ab initio 線形応答計算
  • 選択されたボロフェン構造のプラズモン周波数 (ω) の計算.
  • 小波ベクトル (q) 限界におけるプラズモンの分散の分析.

主要な成果:

  • ボロフェンの電子は2Dの電子ガスのように振る舞う.
  • プラズモンの分散は,予測された ω √q 依存性に従う.
  • 鈍化していないプラズモンの周波数は,近赤外線と可視領域に広がります.

結論:

  • ボロフェンはドーピングなしで高周波で2Dプラズモンをサポートする最初の材料です.
  • ボロフェンの金属性およびアニソトロピーの調節性は,プラズモンの微調整行動を可能にします.
  • ボロフェンはナノプラズモニクスの応用において有望である.