Selection method of resonance Raman excitation wavelength

A technology of excitation wavelength and wave band, which is applied in the field of instrument analysis, can solve the problems of a large amount of test samples and the inability to carry out trace detection, etc., and achieve the effect of simple method and high accuracy

Inactive Publication Date: 2011-11-23
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

[0002] At present, the Raman technology for environmental instrument analysis mainly uses conventional Raman technology. However, conventional Raman technology requires a large amount of test samples, cannot perform trace detection, and cannot perform selective excitation. Identification, similar to infrared spectroscopy

Method used

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  • Selection method of resonance Raman excitation wavelength
  • Selection method of resonance Raman excitation wavelength
  • Selection method of resonance Raman excitation wavelength

Examples

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Embodiment 1

[0019] Using Lambda 900 UV spectrophotometer to measure typical nitrobenzene pollutants: nitrobenzene, 1,3-dinitrobenzene, p-nitrobenzamide, p-nitrotoluene UV absorption spectrum at 200nm-400nm (Concentration is 6×10 -5 mol / L, the solvent is a mixed solvent of methanol and water in a volume ratio of 1:4. ),Such as figure 1 shown. combine Figure 1-5 The experimental spectrogram of the present invention is described in detail. The experimental conditions for obtaining these spectra are as follows: Using Origin8.0 software to compare the ultraviolet absorption spectra of the four nitrobenzene pollutants together, it is found that the four nitrobenzene pollutants have strong Absorption, at the most commercially available laser wavelength of 266nm, the four nitrobenzene pollutants all have strong absorption, so the excitation light with a wavelength of 266nm is selected as the resonance Raman spectrum of the four nitrobenzene pollutants The excitation wavelength of the experi...

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Abstract

The invention discloses a selection method of resonance Raman excitation wavelength. The method comprises the following steps: adopting an ultraviolet absorption spectrometer to measure an ultraviolet absorption spectrum of a compound to be measured, selecting a wave band with strong absorption of the compound to be measured from the ultraviolet absorption spectrum as the wave band of the resonance Raman excitation wavelength of the compound to be measured, and selecting the resonance Raman excitation wavelength of the compound to be measured from the wave band of the resonance Raman excitation wavelength of the compound to be measured. The method is simple and easy to operate, a special device is not required, the accuracy is high, the resonance Raman excitation wavelength can be effectively selected for realizing simultaneous trace detection of single compound or multiple compounds, thereby providing the basic wavelength selection technology for developing resonance Raman analysis and detection of the trace compounds, for example, providing the detection method support for medicament analysis, environment detection and the like.

Description

technical field [0001] The invention relates to the field of instrumental analysis, in particular to a method for selecting resonance Raman excitation wavelengths. Background technique [0002] At present, the Raman technology for environmental instrument analysis mainly uses conventional Raman technology. However, conventional Raman technology requires a large amount of test samples, cannot perform trace detection, and cannot perform selective excitation. Identification, similar to infrared spectroscopy. Resonance Raman spectroscopy is based on conventional Raman spectroscopy, introducing the phenomenon of resonance absorption enhancement. The principle is to use the ultraviolet resonance absorption light of the sample to be tested to excite, so that the Raman signal of the sample to be tested can be resonantly enhanced by several orders of magnitude. . The use of this characteristic of resonance Raman spectroscopy is helpful to detect small or even trace amounts of macro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 裴克梅李芳龙苏明扬陈林
Owner ZHEJIANG SCI-TECH UNIV
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