A device for improving the resolution of electron velocity imaging

Abstract

The invention discloses a device for improving electron velocity imaging resolution. The device comprises a vacuum cylindrical cavity, a repulsion electrode, an extraction electrode, a first grounding electrode, a second grounding electrode, a micro-channel plate, a fluorescent plate and a CCD camera, wherein the repulsion electrode, the extraction electrode, the first grounding electrode, the second grounding electrode, the micro-channel plate, the fluorescent plate and the CCD camera are sequentially placed in the vacuum cylindrical cavity. A compensation electrode is further arranged between the second grounding electrode and the micro-channel plate. The second grounding electrode and the compensation electrode form a compensation flight area, and therefore an inclined focal plane formed by electrons with different magnitudes of energy is converted into a focal plane in the direction vertically parallel to a face plate of a detector. By means of the device, the inclined focal plane formed by electrons with different magnitudes of energy is converted into the focal plane in the direction vertically parallel to the face plate of the detector, the problem that the focal plane and the detector are not spatially in the same vertical plane in the electron beam focusing process is solved, and therefore the resolution of a velocity imaging device is improved.

Description

technical field [0001] The invention relates to the field of molecular reaction dynamics, in particular to a device for improving the resolution of electron velocity imaging. Background technique [0002] In the past few decades, electronic imaging technology has played an important role in the cognition process of laser-molecular photodissociation reaction. The most important issues in the laser-molecular interaction are the dissociation product energy distribution, angle Distribution and velocity distribution, as well as the closing and opening of reaction channels and other information issues, because the electronic velocity imaging method can simultaneously measure these related quantities in the process of laser-molecular interaction, the experimental process is relatively simple, and it can show the experimental results very intuitively. As a result, it has greatly promoted the wide application of velocity imaging technology in the study of molecular reaction dynamics,...

AI Technical Summary

Problems solved by technology

[0004] However, the resolution of the velocity imaging device composed of three plates with holes in the center is not high. One of the main reasons is that the focus of electrons with different energies is not in the same plane when the electron beams are converging, thus forming a There is a large inclination in the focal plane, which makes it difficult to improve the resolution of the velocity imaging device

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