Molecular four-dimensional imaging system

An imaging system and ion velocity imaging technology, applied in the field of molecular four-dimensional imaging devices, can solve the problems of complex femtosecond electron diffraction images, difficult image analysis and identification, etc., and achieve improved instrument analysis capabilities, high time resolution and spatial resolution effect of ability

Inactive Publication Date: 2012-12-19
EAST CHINA NORMAL UNIVERSITY
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Problems solved by technology

[0007] Due to the nonlinear interaction between broadband and high-intensity femtosecond laser pulses and molecular systems, several complex molecular dynamic

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  • Molecular four-dimensional imaging system
  • Molecular four-dimensional imaging system
  • Molecular four-dimensional imaging system

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Embodiment Construction

[0035] Below in conjunction with illustration and specific embodiment, the present invention is described in more detail:

[0036] Figure 1a , 1b It is a structural schematic diagram of the molecular four-dimensional imaging system of the present invention. The molecular four-dimensional imaging system includes: a sample chamber 21, and the sample chamber 21 has four incident windows. In this embodiment, four incident windows with different angles are set for better design of experiments and observation of experimental phenomena. In fact, at least one incident window is required. The sample chamber 21 communicates with the electron gun 44 , the ion velocity imaging device 45 , and the ultrasonic molecular beam generating device 46 respectively. The sample chamber 21 is also in communication with the molecular pump 19 , and the molecular pump 19 is in communication with the front electrode dry pump 20 .

[0037] The incident axes of the electron gun 44 , the ion velocity i...

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Abstract

The invention discloses a molecular four-dimensional imaging system based on femtosecond electron diffraction. The molecular four-dimensional imaging system comprises a femtosecond electronic gun system, an ultrasonic molecular beam system, a sample room, an ion velocity imaging system, a vacuum system and a relevant correction regulating system. Femtosecond electronic impulse is obtained by high-voltage electrode acceleration and magnetic lens focus; and direct and real-time molecular diffraction images can be obtained by the action of the electronic impulse and ultrasonic molecular beams. Auxiliary analysis information such as velocity distribution and angular distribution parameters of dissociation fragments can be obtained by integrating ion velocity imaging technology, so that electronic diffraction images of complicated molecular dynamic processes can be analyzed and identified better. The four-dimensional imaging system has relatively high time resolution capability and spatial resolution capability, can analyze four-dimensional dynamic images with femtosecond time resolution and atomic-scale spatial resolution conveniently under the assist of the ion velocity imaging technology.

Description

technical field [0001] The invention relates to an imaging system, in particular to a molecular four-dimensional imaging device based on femtosecond electron diffraction for studying the ultrafast reaction process of molecules. Background technique [0002] Numerous fundamental physical, chemical and biological processes in nature are usually completed in an ultra-short time. For example, the phase transition of matter usually occurs on the order of nanoseconds or picoseconds, the generation and disappearance of reaction intermediates in chemical reactions is on the order of femtoseconds, and the tailoring of protein molecules occurs on the order of microseconds. These ultrafast physical, chemical and biodynamic processes contain a large amount of information that is very important for understanding the microscopic world and the laws of material changes. [0003] Compared with the indirect methods of traditional spectroscopy to obtain the structural changes of substances, u...

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Application Information

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IPC IPC(8): G01N21/63H01J49/08
Inventor 江熠峰曹琦李静杨岩仝艳丽裴敏洁周彬陈瑜婷邓莉张诗按孙真荣
Owner EAST CHINA NORMAL UNIVERSITY
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