Resonance Raman Spectroscopy

Many  substances, especially colored ones, may absorb laser beam energy and generate strong fluorescence, which contaminates Raman spectrum. This is one of the central problems in Raman spectroscopy, especially when UV lasers are used. Nevertheless, it was discovered that instead of fluorescence, some types of colored molecules could produce strong Raman scattering at certain conditions. This effect was called Resonance Raman.

Resonance Raman Effect occurs when excitation laser frequency is chosen in such a way that it crosses the frequencies of electronic excited states and resonates with them. The intensity of Raman bands, which originate from electronic transitions between those states, are enhanced three-to-five orders of magnitude. Not all the bands of spontaneous Raman spectrum are enhanced. The so-called chromophoric group responsible for the molecules' coloration experiences the highest level of enhancement because the chromophoric group normally has the highest level of light absorption.

The highest intensity of Resonance Raman signal is obtained when laser frequency equals the first of the second electronic excited state (figure below). Therefore, tunable lasers are the most appropriate choice. But even when the frequency of the laser does not exactly match the desired electronic excited states, impressive enhancement of Raman signal occurs. 

PI’s Picks

resonance raman
Resonance Raman
IsoPlane<br>  成像型光谱仪

IsoPlane
成像型光谱仪

这款屡获大奖的成像光谱仪在性能上超越传统的Czerny-Turner光谱系统,可选焦距为203毫米和320毫米的两款设计。



LightField <br> 科学成像及光谱分析软件

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PyLoN <br> 成像型与光谱型相机

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TriVista <br> 三级联光谱仪

TriVista
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TriVista光谱仪提供行业内最优秀的性能和灵活性; 是您真正的顶级科研工具。



PyLoN-IR <br> 线阵型InGaAs相机

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此款一维线阵InGaAs相机提供了16bit 数值深度;最快的光谱速度和最低的系统读出噪音在业界领先。



 

特色产品 Resonance Raman Spectroscopy

IsoPlane<br>  成像型光谱仪

IsoPlane
成像型光谱仪

这款屡获大奖的成像光谱仪在性能上超越传统的Czerny-Turner光谱系统,可选焦距为203毫米和320毫米的两款设计。


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