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Femtosecond time resolved excited Raman spectrum system

A technology of stimulated Raman and spectroscopy systems, applied in the field of Raman spectroscopy, can solve problems such as complex data processing, and achieve the effects of improving signal intensity, avoiding fluorescence interference, and high time resolution.

Inactive Publication Date: 2018-11-23
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the acquisition signal contains a variety of background noise signals, and the data processing is complicated.
In addition, the conventional stimulated Raman spectroscopy can only detect the stimulated Raman signal of the electronic ground state of the molecule, but to detect the stimulated Raman signal of the excited state of the molecule, it is necessary to develop a new stimulated Raman spectroscopy method

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Embodiment 1

[0091] Using the femtosecond time-resolved stimulated Raman spectroscopy system described in the present invention, the structural evolution dynamics of charge-transfer (CT) complexes without covalent bonds were studied, revealing that the dynamics of charge-transfer (CT) complexes that occur during charge separation (CS) (by Franck-Condon Ultrafast process of structural change during excited state complexes to tightly bound ion pairs) and subsequent charge redistribution (CR). Since the vibrational spectrum of the Franck-Condon excited state is similar to that of ion pairs, it can give very important CS properties. figure 2 It is to apply the femtosecond time-resolved stimulated Raman spectroscopy system of the present invention to detect and analyze the excited state dynamics process of all-trans β-carotene, and observe the excited state dark process of β-carotene (S *) generation mechanism and dynamics.

Embodiment 2

[0093] The femtosecond time-resolved stimulated Raman spectroscopy system of the present invention is used to study the relationship between the aggregate structure and its excited state properties, revealing the influence of aggregate structure parameter changes on molecular aggregate spectra. When the influence of molecular vibration is not considered, the spectral shape and unimodal or multimodal characteristics of the aggregates are mainly determined by the spatial packing structure of the aggregates, which can better highlight the aggregation of molecular aggregates. However, in actual situations, some molecules often have a complex multi-peak structure in the spectrum of a single molecule due to the vibration energy level. After the molecular aggregate is formed, only by considering its vibration effect can the simulated calculation of the spectrum coincide with the experimental results. And analyze which spectral features are caused by unimolecular vibration and which sp...

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Abstract

The invention discloses a femtosecond time resolved excited Raman spectrum system, which can be used for detecting the vibration dynamics of the molecular electron base state, can also be used for detecting the vibration dynamics of the molecular electron excitation state, and can give out rich information relevant to molecular electron excitation state properties, particularly vibration excitation state dynamics. The Raman spectrum system generates excitation light, Raman pumping light and detection light; a spectrum instrument can perform double chopping modulation on the excitation light and the Raman pumping light, and can control the time sequence of the excitation light, Raman pumping light and detection light reaching the samples. The wavelength of the Raman pumping light can be continuously tuned; the whole-frequency excited Raman spectrum from visible light to near ultraviolet waveband can be obtained; in addition, the proper wave length can be selected to effectively avoid the fluorescence interference; the intensity of the excited Raman spectrum can be improved under the resonance conditions; the defects of low sensitivity and fluorescence interference of the conventional Raman spectrum are overcome.

Description

technical field [0001] The invention belongs to the technical field of Raman spectroscopy, in particular to a femtosecond time-resolved stimulated Raman spectroscopy system. Background technique [0002] The existence of the Raman effect is universal. This effect generally exists in molecules, whether it is gaseous, liquid or solid. Moreover, Raman spectroscopy has almost no special requirements for the preparation of samples; Detect samples on the order of milligrams or even micrograms; Raman scattering spectroscopy can achieve non-destructive detection of samples, especially suitable for the detection and analysis of rare or precious samples, and can even be used to detect biological living substances. Raman spectroscopy is also a powerful tool for analyzing molecular structures. A single spectrum can contain rich sample structure information and is widely used in the study of molecular reaction processes such as biology and chemistry. However, the disadvantages of Raman s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01J3/44
CPCG01J3/44G01J2003/4424G01N21/65G01N2021/655
Inventor 郭前进夏安东宋宏伟
Owner INST OF CHEM CHINESE ACAD OF SCI
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