Multi-purpose ultrafast electric diffraction apparatus

Abstract

The invention relates to a multipurpose ultrafast electron diffraction device, which comprises a laser source, an electron gun capable of generating ultrafast electron beams, a sample chamber, an electron diffraction image detector and a vacuum pumping system, wherein a cathode and an anode are arranged in the electron gun; the cathode is plated with a metallic film; the center of the anode is provided with an anode keyhole; an insulating ring is arranged between the cathode and the anode; the electron gun and the sample chamber are connected through an electron beam channel; the outer circumference of the electron beam channel is sleeved with a magnetic coil; a joint of the electron beam channel and the sample chamber is provided with an electron beam channel keyhole; the diameter of the electron beam channel keyhole is between phi 1 and phi 2 millimeters; and a vacuum system comprises an electron gun vacuum system connected with the electron gun, as well as a sample chamber vacuum system connected with the sample chamber. The multipurpose ultrafast electron diffraction device provided by the invention solves the problems that the prior ultrafast electron diffraction device can not simultaneously adapt to solid-phase and vapor-phase electron diffraction experiments, can not regulate energy, is serious in the distortion of an electric field near the anode, and is invalid in photocathode.

Description

technical field [0001] The invention relates to an ultrafast electron diffraction device, which is an important experimental device for researching and detecting the state of matter, the phase transition of material transient structure, and the process of material structure change in some chemical or biological reaction processes. Background technique [0002] The ultrafast electron diffraction device mainly includes a laser light source, an electron gun that generates ultrafast electron beams, a sample chamber, an electron diffraction image detector, a vacuum system, etc., and the ultrafast electron gun driven by ultrashort laser pulses is the core of the device. [0003] Foreign scholars have done a lot of research: such as J.Cao, Z.Hao, H.Park, C.Tao, et al; Appl.Phys.Lett., 2003, 83 (5): 1044-1046; Hyotcherl Ihee, Valdimir A. Lobastov, Udo M. Gomez, et al., Science, 2001, 291 (19): 458-462; J. Charles Williamson, J. Cao, Hyotcherl Ihee, et al. Nature, 1997, 386 (13): 15...

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a multi-purpose ultrafast electron diffraction device, which solves the problem that the existing ultrafast electron diffraction device cannot adapt to the electron diffraction experiments of solid phase and vapor phase at the same time, and the electron energy cannot be adjusted. The technical problem that the electric field is seriously distorted and the photocathode may fail

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