Absolute Cross Sections for Direct and Dissociative Ionizations of Oxygen Molecule Measured by 350-8000 eV Electron Impact  

350~8000 eV电子碰撞O_(2)分子电离解离截面的绝对测量

作　　者：Weizhe Huang Taj Wali Khan Yuting Zhang Enliang Wang Xu Shan Xiangjun Chen 黄伟哲;Khan;Taj;Wali;张雨亭;王恩亮;单旭;陈向军(中国科学技术大学近代物理系,合肥微尺度物质科学国家研究中心,合肥230026)

机构地区：[1]Hefei National Research Center of Physical Sciences at the Microscale and Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Journal of Chemical Physics》2025年第2期164-171,I0039,共9页化学物理学报(英文)

基　　金：supported by the National Key Research and Development Program of China(No.2022YFA1602502);the National Natural Science Foundation of China(No.12127804).

摘　　要：The direct and dissociative ionizations of oxygen molecule are investigated experimen-tally by electron collision with energies from 350 eV to 8000 eV.The absolute ionization cross sections for the product ions(O_(2)^(2+),O_(2)^(2+)O^(+),O^(2+),and their total)and two Coulomb explosion channels(O^(+)+O^(+)and O^(2+)+O^(+))are obtained by putting the data of O^(2+)on the scale of Ar+from O_(2)and Ar gases mixed with a fixed relative flow ratio of 1:1.The experimental errors are assessed by taking uncertainties of various factors into account.The present absolute cross sections are well consistent with the previous data in the overlapped energy range below 1000 eV.本文利用能量为350~8000 eV的电子碰撞实验,开展了O_(2)分子的电离和解离研究.测量了产物离子O^(2+),O_(2)^(2+),O^(+)和O^(2+)的部分电离截面和电离解离通道O^(+)+O^(+)与O^(2+)+O+的截面,并利用相对气体流量标定方法,通过将O2+与Ar+的截面数据归一,获得了350~8000 eV电子碰撞O_(2)分子电离解离的绝对截面.考虑到实验中多个因素的不确定性,本文评估了截面数据的误差.与文献中O_(2)分子电离截面数据相比,本文的截面数据与文献中的推荐数据在电子能量小于1000 eV的重叠区域具有很好的一致性,补充了电子能量大于1000 eV的绝对截面数据.

关 键 词：Electron collision Absolute ionization cross section Oxygen molecule 

分 类 号：O562.3[理学—原子与分子物理] O562[理学—物理]