Photon Science Institute, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom.
J Chem Phys. 2019 Nov 21;151(19):194305. doi: 10.1063/1.5127121.
A new study of electron-impact single ionization of the HOMO 1t state of CH has been conducted at incident electron energies 20 eV and 40 eV above the ionization energy of the state. Triple differential cross sections were measured from a coplanar symmetric geometry, where scattered and ionized electrons were detected at equal angles, through to the perpendicular geometry where the outgoing electrons emerged orthogonal to the incident electron beam. At the lower energy, the electrons were detected with equal energies of 10 eV, whereas at the higher energy, data were obtained for equal energies of 20 eV and for unequal energies of 5 eV and 35 eV. The results are compared to a molecular 3-body distorted wave approximation that used a full averaging procedure to allow for the random orientation of the target, an orientation averaged molecular orbital model that averages the target wavefunction over all orientations prior to the collision, and a distorted wave Born approximation that does not include postcollisional interactions.
一项新的研究表明，在 HOMO 1t 态的 CH 单电子碰撞离化中，入射电子能量分别比该态的离化能高出 20 eV 和 40 eV。在共面对称几何结构中测量了三重微分截面，其中散射电子和离化电子以相等的角度被探测，直到垂直几何结构，其中出射电子与入射电子束正交。在较低的能量下，电子以相等的能量 10 eV 被探测，而在较高的能量下，获得了相等能量 20 eV 和不等能量 5 eV 和 35 eV 的数据。结果与分子三体扭曲波近似进行了比较，该近似使用了完全平均程序，以允许目标的随机取向，一个在碰撞前对目标波函数进行平均的取向平均分子轨道模型，以及一个不包括碰撞后相互作用的扭曲波玻恩近似。
