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A new laser light source near atmospheric pressure light emission electron microscope was successfully developed

Recently, the sub project "development of near atmospheric pressure light emission electron microscope based on tunable deep UV laser light source" of the national major scientific research equipment development project - "research and development of advanced equipment of deep UV solid-state laser source (phase II)" undertaken by Fu Qiang and Bao Xinhe, researchers of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, successfully passed the on-site technical test and acceptance.

In this project, the tunable deep ultraviolet laser light source independently developed by China is used as the excitation light source. Through the design and development of key components such as the multi-stage accelerating electron optical system, the multi-stage differential vacuum pumping system and the near atmospheric pressure sample chamber, * * the imaging function of the deep ultraviolet laser light emission electron microscope under the near atmospheric pressure atmosphere is realized, * the high imaging pressure is more than 1 mbar, and the resolution of the near atmospheric pressure light emission electron microscope is 30 nm, It is a * * * * and unique in-situ dynamic surface imaging research platform.

Light emission electron microscopy can perform real-time in-situ dynamic imaging of solid surface processes. So far, light emission electron microscopy imaging needs to be in ultra-high vacuum and high vacuum environment, which has a huge pressure gap with the actual process. The developed near atmospheric pressure light emission electron microscope can conduct surface imaging research under near real reaction conditions, and has wide applications in catalysis, energy, nanoscience, biology and other fields.