双微分和三微分截面研究电子碰撞苯分子单电离

Double and Triple Differential Cross Sections for Single Ionization of Benzene by Electron Impact.

机构信息

Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 113-bis, 28006 Madrid, Spain.

Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal.

出版信息

Int J Mol Sci. 2021 Apr 27;22(9):4601. doi: 10.3390/ijms22094601.

DOI:10.3390/ijms22094601

PMID:33925653

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8124667/

Abstract

Experimental results for the electron impact ionization of benzene, providing double (DDCS) and triple differential cross sections (TDCS) at the incident energy of 90 eV, measured with a multi-particle momentum spectrometer, are reported in this paper. The most intense ionization channel is assigned to the parent ion (CH) formation. The DDCS values are presented for three different transferred energies, namely 30, 40 and 50 eV. The present TDCS are given for two fixed values of the ejected electron energy (E), at 5 and 10 eV, and an electron scattering angle (θ) of 10°. Different features related to the molecular orbitals of benzene from where the electron is extracted are observed. In addition, a semi-empirical formula to be used as the inelastic angular distribution function in electron transport simulations has been derived from the present DDCS result and compared with other expressions available in the literature.

摘要

本文报道了在 90eV 入射能下使用多粒子动量谱仪测量的苯的电子碰撞离化实验结果，提供了双微分截面（DDCS）和三重微分截面（TDCS）。最强烈的电离通道被分配给母离子（CH）的形成。为三个不同的转移能量，即 30、40 和 50eV，给出了 DDCS 值。给出了 present TDCS 在两个固定的出射电子能量（E）值，即 5 和 10eV，以及电子散射角（θ）为 10°的情况下的值。观察到了与从苯分子轨道中提取电子相关的不同特征。此外，从 present DDCS 结果推导出了一个半经验公式，用作电子输运模拟中的非弹性角分布函数，并与文献中提供的其他表达式进行了比较。