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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 Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
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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...
1.2K
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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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...
2.5K
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

1.0K
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...
1.0K
IR Spectrum01:19

IR Spectrum

1.1K
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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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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在线合成多八度相稳定红外光线.

Hadil Kassab, Sebastian Gröbmeyer, Wolfgang Schweinberger

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    我们开发了一个紧的中红外辐射源,使用脉冲差频生成 (IPDFG) 进行分子光谱学. 这种强大的系统实现了广泛的光谱覆盖和高连贯性,使先进的光谱技术成为可能.

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    科学领域:

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

    背景情况:

    • 分子振动光谱需要具有广泛光谱覆盖,高亮度和连贯性的中红外辐射.
    • 现有的产生这种辐射的方法往往不稳固或紧.
    • 内脉差频生成 (IPDFG) 提供了可取的特性,但在源集成方面面临挑战.

    研究的目的:

    • 开发一种强大而紧的辐射源,用于中红外分子振动光谱.
    • 为了实现广泛的光谱覆盖 (8003000厘米-1) 具有高亮度和光学相一致性.
    • 为了实现先进的连贯光谱技术.

    主要方法:

    • 在多晶体直线几何学中使用的脉冲差频生成 (IPDFG).
    • 使用来自Yb:YAG薄盘振荡器的10.6fs脉冲.
    • 采用双色波板和LiIO3和LiGaS2晶体的序列进行集成的极化定制.

    主要成果:

    • 在-30dB强度下,实现了从800厘米-1到3000厘米-1的同时光谱覆盖.
    • 在中红外线中产生了130mW的平均功率.
    • 通过理论和超宽带电光采样证实,在直线几何学中保持了光学相连贯性.

    结论:

    • 开发的多晶IPDFG源为中红外光谱学提供了强大而紧的解决方案.
    • 该源的广泛光谱覆盖,高亮度和一致性适用于先进的光谱应用.
    • 这项技术为连贯光谱,非线性超快光谱和光学波形合成铺平了道路.