近日，浙江工业大学曾交龙团队研究了等离子体环境对嵌入在致密等离子体中的离子俄歇电子能谱的影响。这一研究成果发表在2025年8月25日出版的《物理评论A》杂志上。

内空位态俄歇衰变过程中所发射的电子的特征动能携带着元素及其在原子、分子、液体和固体中的化学环境的宝贵信息。其中，俄歇电子能谱（AES）作为基础研究和应用研究的重要实验工具而受到广泛关注。然而，在致密等离子体环境中，俄歇电子的动能被显著地改变，因此与孤立物质相比，AES显示出新的特征。

研究组从理论上研究了嵌套在致密等离子体中的不同电荷态铁离子的K-空位态和2p-空位态的AES。与孤立离子相比，俄歇电子的动能明显向高能转移；质量密度和电离阶段越高，俄歇电子的动能位移越大。俄歇电子的动能位移也是弱温度依赖性的，等离子体温度越高，其位移越小。螺旋钻的宽度为2等离子体环境对p空位态的影响比k空位态更明显，特别是在较高的等离子体密度下。该工作的发现有助于研究致密等离子体中的俄歇过程和辐射特性，如恒星内部的天体物理等离子体和x射线自由电子激光器与固体、液体、纳米等离子体和低温等离子体相互作用产生的实验室等离子体。

附：英文原文

Title: Plasma environmental effect on Auger electron spectroscopy of an ion embedded in a dense plasma

Author: Jiaolong Zeng, Yihua Huang, Aihua Deng, Cheng Gao, Yong Hou, Jianmin Yuan

Issue&Volume: 2025/08/25

Abstract: The characteristic kinetic energies of electrons emitted in Auger decay processes of inner-vacancy states carries valuable information of the element and its chemical environment in atoms, molecules, clusters, liquids, and solids. Thus, Auger electron spectroscopy (AES) is widely used as an important experimental tool in both fundamental and applied research. In a dense plasma environment, however, the kinetic energies of Auger electrons are significantly modified and therefore AES shows new features compared with that of the isolated species. Here, we theoretically investigated the AES of K- and 2p-vacancy states for different charge states of iron ions embedded in dense plasma. It is found that the kinetic energy of the Auger electron is evidently shifted toward higher energy compared with the isolated ion; The higher the mass density and ionization stage, the larger shift the kinetic energy of the Auger electron. The shift of kinetic energy of the Auger electron is also weakly temperature dependent with a lower shift at a higher temperature of the plasma. The Auger widths of the 2p-vacancy states are more evidently affected by the plasma environment than the K-vacancy states, especially at a higher plasma density. The findings of the present work are helpful for the study of Auger processes and radiative properties in dense plasmas such as astrophysical plasmas in the interior of stars and laboratory plasmas produced in interaction of x-ray free-electron lasers with solids, liquids, nanoplasmas, and clusters.

DOI: 10.1103/mlkr-69h4

Source: https://journals.aps.org/pra/abstract/10.1103/mlkr-69h4