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関連する概念動画

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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 process,...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...

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Updated: Jun 3, 2026

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

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

量子カスケードレーザーベースの振動型円形二極化.

Steffen Lüdeke1, Marcel Pfeifer, Peer Fischer

  • 1Institute for Pharmaceutical Sciences, University of Freiburg, Albertstr. 25, 79104 Freiburg, Germany.

Journal of the American Chemical Society
|March 31, 2011
PubMed
まとめ
この要約は機械生成です。

調節可能な量子カスケードレーザー (QCLs) は,振動円二極化 (VCD) スペクトロスコーピーの強力な新機能を提供します. この明るい光源は,VCD研究において,水のような挑戦的で強く吸収する溶媒を研究することを可能にします.

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

関連する実験動画

Last Updated: Jun 3, 2026

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

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

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

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

科学分野:

  • スペクトル顕微鏡検査です.
  • 物理化学 物理化学
  • 量子光学とは,量子光学である.

背景:

  • 振動循環二重化 (VCD) スペクトロスコピーは,分子キラリティを決定するための強力な技術です.
  • 伝統的なVCD測定は,赤外線光源の低出力,特に強く吸収する溶媒によって制限されています.
  • 水のような強く吸収する溶媒は,高い信号衰弱により,VCD分析に重大な課題をもたらします.

研究 の 目的:

  • 調整可能な外腔量子カスケードレーザー (QCL) がVCDスペクトロスコピーの新しい光源としての可能性を調査する.
  • 挑戦的なメディアでのVCD測定のためのQCLの強化された明るさと適用性を実証する.
  • 水溶液中の化合物を分析するためのQCLベースのVCDの有用性を示します.

主な方法:

  • 振動型円形の二重化 (VCD) のスペクトルを,調節可能な外腔量子カスケードレーザー (QCL) を使用して記録します.
  • 同じQCLシステムで赤外線 (IR) 吸収測定を行う.
  • 水中のプロリンを含む様々な化合物を用い,その方法の有効性を実証した.

主要な成果:

  • QCLは,標準的な赤外線熱光源と比較して,かなり高い出力を提供します.
  • QCLの明るさを高めることで,強吸収性溶媒におけるVCDおよびIR吸収の測定が可能になります.
  • 水中のプロリンについて,VCDおよびIR吸収スペクトルが得られ,実現可能性が実証されました.

結論:

  • 調節可能な外腔量子カスケードレーザーは,VCD光譜学の有望な進歩を表しています.
  • QCLの高い電力と調節性は,従来の光源に関連する制限を克服します.
  • QCLベースのVCDスペクトロスコピーは,水溶液を含む多様で困難なサンプル環境におけるキラル分析のための新しい道を開きます.