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相关概念视频

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...
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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...
866
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%...
1.0K
IR Spectrometers01:25

IR Spectrometers

1.1K
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...
1.1K
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

969
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...
969
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

2.1K
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...
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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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用于中红外高光谱成像的表面等离子体-声子.

Hong Zhou1,2, Dongxiao Li1,2, Zhihao Ren1,2

  • 1Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore.

Science advances
|May 29, 2024
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概括

表面语音增强了超谱成像灵敏度和分子识别,优于等离子系统的性能. 这种语音极声学的进步有望在查和制药分析方面取得突破.

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 材料科学 材料科学 材料科学
  • 频谱学是一种光谱学.

背景情况:

  • 表面等离子体通过增强光物相互作用来提高中红外高光谱成像灵敏度.
  • 表面声子在高光谱成像中的作用仍然不清楚.
  • 纳米天线为探索合的等离子体 - 声子现象提供了一个平台.

研究的目的:

  • 调查表面声子对高光谱成像的贡献.
  • 开发一种新的等离子体 - 声子高光谱成像系统.
  • 通过使用声模式来证明增强的分子识别能力.

主要方法:

  • 从堆叠的等离子-声子材料开发非对称的十字形纳米天线.
  • 利用光极化来控制音声模式并捕捉分子特征.
  • 采用深度学习来进行高光谱图像分析和识别.
  • 展示严重急性呼吸系统综合征冠状病毒 (SARS-CoV) 尖端蛋白的成像.

主要成果:

  • 声波模式捕捉出不同的分子折射率强度和线形特征.
  • 增强了SARS-CoV.用声子 (230,400光谱/秒) 的识别能力.
  • 促进了混合SARS-CoV尖端蛋白的脱重叠和空间分布观察.
  • 实现了93%的识别准确度,提高了灵敏度,并将检测限制降至分子单层.

结论:

  • 表面声子对高光谱成像做出了重大贡献,提供了精确的分子识别.
  • 开发的等离子体-声系统在灵敏度和精度方面超过了等离子体对应物.
  • 在超光谱成像中集成的Phonon极子学为分子查和制药分析开辟了新的途径.