Molecular four-dimensional imaging system

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...

AI Technical Summary

Problems solved by technology

[0007] Due to the nonlinear interaction between broadband and high-intensity femtosecond laser pulses and molecular systems, several complex molecular dynamics processes are generated, and the related femtosecond electron diffraction images are very complex, and image analysis and identification are very difficult.

Images