ARC Centre for Antimatter-Matter Studies, School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia.
J Chem Phys. 2013 Feb 21;138(7):074301. doi: 10.1063/1.4789584.
We present total, elastic, and inelastic cross sections for positron and electron scattering from tetrahydrofuran (THF) in the energy range between 1 and 5000 eV. Total cross sections (TCS), positronium formation cross sections, the summed inelastic integral cross sections (ICS) for electronic excitations and direct ionization, as well as elastic differential cross sections (DCS) at selected incident energies, have been measured for positron collisions with THF. The positron beam used to carry out these experiments had an energy resolution in the range 40-100 meV (full-width at half-maximum). We also present TCS results for positron and electron scattering from THF computed within the independent atom model using the screening corrected additivity rule approach. In addition, we calculated positron-impact elastic DCS and the sum over all inelastic ICS (except rotations and vibrations). While our integral and differential positron cross sections are the first of their kind, we compare our TCS with previous literature values for this species. We also provide a comparison between positron and electron-impact cross sections, in order to uncover any differences or similarities in the scattering dynamics with these two different projectiles.
我们给出了正电子和电子与四氢呋喃（THF）散射的总截面、弹性截面和非弹性截面，能量范围在 1 到 5000 eV 之间。我们测量了在选定的入射能量下，THF 中与正电子碰撞的总截面（TCS）、正电子素形成截面、电子激发和直接电离的总和非弹性积分截面（ICS）以及弹性微分截面（DCS）。用于进行这些实验的正电子束的能量分辨率在 40-100 meV（半高全宽）范围内。我们还在独立原子模型内使用屏蔽修正加和规则方法，给出了正电子和电子与 THF 散射的 TCS 结果。此外，我们计算了正电子碰撞的弹性 DCS 和所有非弹性 ICS（旋转和振动除外）的总和。虽然我们的积分和微分正电子截面是此类截面的首次报告，但我们将我们的 TCS 与该物质的先前文献值进行了比较。我们还提供了正电子和电子碰撞截面之间的比较，以便揭示这两种不同射弹散射动力学的任何差异或相似之处。
