Laser flash photolysis instrument capable of imaging scanning

Abstract

The invention discloses a laser flash photolysis instrument capable of imaging scanning. The instrument consists of: a pumping light path for pumping excitation of a to-be-detected sample, a probing light path for irradiation of a pumping light excited area of the to-be-detected sample, a sample scanning table for fixing the to-be-detected sample and capable of displacement in a three-dimensional space, and a receiving light path for collecting the probe light scattered or reflected by the to-be-detected sample. The instrument provided by the invention realizes spatial discrimination transient absorption spectrum detection on the to-be-detected sample, and then reconstructs a spatial distribution graph of the to-be-detected sample's transient absorption spectrum.

Description

technical field [0001] The invention relates to a device for detecting three-dimensional transient absorption spectrum. More specifically, it relates to an image-scanning laser flash photolysis device. Background technique [0002] Transient absorption spectroscopy refers to the accompanying absorption phenomenon that occurs when a material is stimulated to absorb, reflecting the energy transition between different short-lived excited electronic states. Laser Flash Photolysis (Laser Flash Photolysis) is an important technical means to obtain the transient absorption spectrum of materials, and then to detect transient response processes such as photochemistry and photophysics, including two-photon absorption, stimulated emission, excited state absorption, and ground state depletion. , transitions between triplet states, etc. Usually, two beams of light are used to detect the transient absorption process: the pump light mainly makes the sample realize the transition from the...

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Problems solved by technology

[0004] However, the surface of the sample to be tested (solid material) is generally inhomogeneous, especially for some surface-modified semiconductor nanocrystal materials, the spectral characteristics at the modified site will change significantly; in addition, for some bulk materials, the instantaneous state absorption spectral properties are also significantly different from their internal properties

Using the existing commercial laser flash photolysis instrument, whether it is pump light or probe light, it uses a large spot to irradiate the sample to be tested in a large area, and cannot spatially resolve different surface areas, interfaces, and interiors of the sample. Transient absorption spectroscopy probing, so further study of spatially different properties of time-resolved transient absorption spectroscopy of different materials is not possible

[0005] To sum up, the laser flash photolysis instrument widely used in the field of transient absorption spectroscopy detection at present cannot effectively detect different regions of samples (especially solids) with spatial resolution, and then infer materials through time-resolved spectral information. Spatial distribution differences (research on nano-modified functional groups, etc.), in order to more intuitively and effectively resolve the spatial distribution of transient absorption spectra by time, and analyze the further impact of chemical modification groups in different regions on transient absorption spectra, it is necessary to design and develop An image-scanning laser flash photolysis device to solve the technical bottleneck that existing devices cannot perform time-resolved transient absorption spectroscopy and space-resolved characterization

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