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相关概念视频

IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
1.6K
IR Spectrum01:19

IR Spectrum

1.0K
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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灵敏的离散频率中红外吸收光谱使用数字引用检测.

Ruo-Jing Ho1,2, Kevin Yeh1, Yen-Ting Liu1,3

  • 1Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.

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概括

数字引用检测 (DRD) 降低了基于激光的光谱和显微镜中的噪声. 这种技术提高了信号噪声比,使得测量速度更快,提高了化学物质检测能力.

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科学领域:

  • 光谱学和光谱仪学
  • 激光技术 激光技术
  • 化学分析 化学分析

背景情况:

  • 中红外 (IR) 激光器与量子级联激光器 (QCL) 一样,对于振动光谱学至关重要,能够快速检测化学物质.
  • 目前的基于激光的光谱仪提供高吞吐量,但受到QCL噪声的限制,影响信号噪声比 (SNR) 和采集时间.
  • 与新兴激光技术相比,现有的富里埃变换红外光谱法面临着速度和灵敏度的挑战.

研究的目的:

  • 引入数字引用检测 (DRD) 作为一种方法,以克服激光谱仪和显微镜中的噪声限制.
  • 为了证明DRD与各种激光光谱仪和显微镜设计的兼容性.
  • 提高测量灵敏度,减少光谱和显微镜应用中的采集时间.

主要方法:

  • 使用高速数字化器和双探测器实现DRD,以单独数字引用每个激光脉冲.
  • 将DRD集成到现有的光谱仪和显微镜系统中.
  • 在不同的光谱技术中验证DRD的有效性,包括振动光谱和振动循环二元化 (VCD).

主要成果:

  • 在光谱仪中,DRD可显著降低光谱噪声,高达10倍.
  • 使用DRD的显微镜应用以8倍更快的采集速度 (1脉冲停留时间) 实现了正常的SNR.
  • VCD测量显示,随着DRD实施,扫描时间减少了约4倍.

结论:

  • 激光光谱是一种多功能和有效的技术,用于提高激光光谱和显微镜的灵敏度和速度.
  • 该方法提供了广泛的光谱冷漠性,并且可以适应各种系统设计,最小的硬件修改.
  • DRD提供了一个有希望的,简单的模块,用于推进利用激光进行化学分析的光谱仪和显微镜设计.