慢电子速度成像技术

摘要

基于速度成像的光电子能谱实验技术是研究原子分子的重要工具.最近发展起来的慢电子速度成像技术大大提高了光电子能谱的分辨率.本文对这一实验技术的发展和特点作了简要介绍.利用慢电子速度成像技术,我们成功地将多个过渡族元素电子亲和势的测量精度提高了约两个量级.这项技术和冷离子阱技术相结合,为研究原子分子团簇提供了一种新的高分辨方法.%Photoelectron spectroscopy based on the velocity-map imaging method is a powerful tool for exploring the structures of atoms and molecules.The newly developed slow electron velocity-imaging (SEVI) technology significantly improves the energy resolution of photoelectron spectroscopy.We briefly review the development of SEVI and its features.With SEVI,we successfully improved the accuracy of the electron affinities of a few transitional elements by two orders of magnitude.The combination of SEVI and the cold-ion-trap provide a new high-resolution spectroscopic method for investigating the structures of atoms,molecules,and clusters.