Positron scattering from pyridine.

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.

我们给出了吡啶在入射正电子能量小于20电子伏特时的低能散射的一系列截面测量结果，以及考虑了干涉效应的屏蔽校正相加规则的独立原子模型对吡啶正电子散射的计算结果，其中偶极转动激发采用玻恩近似处理。对实验测量结果和理论计算进行了比较。对于正电子素形成截面，我们还与一个近期的经验模型的结果进行了比较。总体而言，尽管仍存在一些差异可能需要进一步研究，但在计算和测量之间看到了相当好的一致性。希望本研究将促进应用于这一重要散射系统的从头算水平理论方法的发展。