Plasma Research Laboratory, Research School of Physics and Engineering, Australian National University, Acton, Canberra 2601, Australia.
College of Science and Engineering, Flinders University, Adelaide, SA, Australia.
J Chem Phys. 2018 Apr 14;148(14):144308. doi: 10.1063/1.5024246.
We present a range of cross section measurements for the low-energy scattering of positrons from pyridine, for incident positron energies of less than 20 eV, as well as the independent atom model with the screening corrected additivity rule including interference effects calculation, of positron scattering from pyridine, with dipole rotational excitations accounted for using the Born approximation. Comparisons are made between the experimental measurements and theoretical calculations. For the positronium formation cross section, we also compare with results from a recent empirical model. In general, quite good agreement is seen between the calculations and measurements although some discrepancies remain which may require further investigation. It is hoped that the present study will stimulate development of ab initio level theoretical methods to be applied to this important scattering system.
我们呈现了一系列从吡啶中散射出的低能正电子的截面测量结果，用于入射正电子能量小于 20 eV 的情况，以及包括干涉效应计算的屏蔽修正加性规则的独立原子模型，用于计算吡啶中的正电子散射，其中使用 Born 近似考虑了偶极子旋转激发。我们将实验测量结果与理论计算结果进行了比较。对于正电子素形成截面，我们还与最近的经验模型的结果进行了比较。总的来说，计算结果与测量结果非常吻合，尽管仍然存在一些差异，可能需要进一步研究。我们希望本研究将激发应用于这一重要散射体系的从头算理论方法的发展。
