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相关概念视频

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

基于量子级联激光的振动循环二元化.

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
概括
此摘要是机器生成的。

可调节的量子级联激光器 (QCL) 为振动循环二元化 (VCD) 光谱学提供了强大的新功能. 这种明亮的光源使VCD研究能够在具有挑战性的,强烈吸收水等溶剂中进行.

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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
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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科学领域:

  • 频谱学是一种光谱学.
  • 物理化学 物理化学
  • 量子光学是一种量子光学.

背景情况:

  • 振动循环二元化 (VCD) 光谱是确定分子性的一种强大技术.
  • 传统的VCD测量受到红外光源的低功率的限制,尤其是在强烈吸收溶剂中.
  • 强烈吸收的溶剂,如水,由于信号衰减的高,给VCD分析带来了重大挑战.

研究的目的:

  • 调查可调整的外腔量子级联激光器 (QCL) 作为VCD光谱学的新光源的潜力.
  • 为了证明QCL在具有挑战性的介质中用于VCD测量的增强亮度和适用性.
  • 展示基于QCL的VCD用于分析水溶液中的化合物的实用性.

主要方法:

  • 使用可调整的外腔量子级联激光器 (QCL) 记录振动循环二元化 (VCD) 光谱.
  • 使用相同的QCL系统进行红外 (IR) 吸收测量.
  • 使用一系列化合物,包括水中的,以证明该方法的有效性.

主要成果:

  • 与标准的红外热光源相比,QCLs的输出功率显著更高.
  • 增强的QCL的亮度使VCD和IR吸收测量在强烈吸收的溶剂.
  • 在水中获得了成功的VCD和IR吸收光谱,证明了proline的可行性.

结论:

  • 可调节的外腔量子级联激光器代表了VCD光谱学的有前途的进步.
  • QCLs的高功率和调整性克服了与传统光源相关的局限性.
  • 基于QCL的VCD光谱学为在多样化和具有挑战性的样本环境 (包括水溶液) 中进行奇拉分析开辟了新的途径.