Department of Physics, School of Engineering, Sir Padampat Singhania University, Bhatewar, Udaipur 313 601, India.
Department of Physics, University College of Science, M.L.S. University, Udaipur 313001, India.
J Chem Phys. 2019 Feb 7;150(5):054304. doi: 10.1063/1.5088966.
We report here triply differential cross sections (TDCSs) for 81 eV electron and positron-impact ionization of the combined (1b + 3a) orbitals of the water molecule by using the second-order distorted wave Born approximation (DWBA2) for ejection electron and positron energies of 5 eV and 10 eV and different momentum transfer conditions. The electron-impact TDCS will be compared with the experimental data measured by Ren et al. [Phys. Rev. A 95, 022701 (2017)] and with the molecular 3-body distorted wave (M3DW) approximation results in the scattering plane as well as the perpendicular plane. The DWBA2 results are in better agreement with the experiment than the M3DW results for the scattering plane, and the M3DW results are somewhat better for the perpendicular plane. This observation is explained in terms of collision interactions. The electron and positron TDCSs are indistinguishable in the scattering plane. In the perpendicular plane, the positron results are similar in shape, but smaller in magnitude. However, the difference reduces with increasing projectile scattering angle and increasing ejected electron energy.
我们在这里报告了在 81eV 电子和正电子碰撞下，水分子的（1b+3a）轨道的三重微分截面（TDCS），使用的是二级扭曲波玻恩近似（DWBA2），用于发射电子和正电子能量为 5eV 和 10eV，以及不同的动量转移条件。电子碰撞 TDCS 将与 Ren 等人[Phys. Rev. A 95, 022701 (2017)]测量的实验数据进行比较，并与散射平面和垂直平面中的分子三体扭曲波（M3DW）近似结果进行比较。DWBA2 结果在散射平面上比 M3DW 结果更符合实验，而在垂直平面上，M3DW 结果则略好一些。这一观察结果可以用碰撞相互作用来解释。电子和正电子 TDCS 在散射平面上是不可区分的。在垂直平面上，正电子结果的形状相似，但幅度较小。然而，随着入射散射角和射出电子能量的增加，这种差异会减小。
