Positron scattering from pyrazine

Positron scattering from pyrazine
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吡嗪的正电子散射

DOI:
10.1103/physreva.104.042807
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发表时间:
2021
期刊:
影响因子:
2.9
通讯作者:
Edwards D
Edwards D
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Edwards D

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本文对吡嗪的正电子散射进行了实验和理论研究。实验数据是使用低能量正电子光束线测量的,覆盖了从1到79 eV的能量范围。测量了总散射、总弹性散射、正电子形成、直接电离和总离散电子态激发过程的截面。此外,还报道了测量的各个态的电子激发总截面。最后还给出了能量范围内的实验弹性微分截面(DCS)。给出了两种理论方法的结果:热矩阵法和屏蔽校正的可加性规则和干扰项的独立原子法。在我们的实验结果和理论结果之间可以进行比较的地方,根据所考虑的实际散射过程,一致性的程度从非常好到边缘不等。最后,比较了目前的弹性分散控制系统的结果与我们以前的研究结果的正电子散射的嘧啶[帕里哈瓦达纳,物理。A修订版88,012717(2013)PLRAAN1050-294710.1103/PhysRevA.88.012717]显示出某种程度上出乎意料的同意。
The present paper provides a joint experimental and theoretical study of positron scattering from pyrazine. Experimental data were measured employing a low-energy positron beamline, and covered an energy range from 1 to 79 eV. Cross sections were measured for total scattering, total elastic scattering, positronium formation, direct ionization, and the sum of the total discrete electronic-state excitation processes. In addition, measured total electronic excitation cross sections for the individualandstates are also reported. Finally, experimental elastic differential cross sections (DCSs), here in the energy rangeeV, are also presented. Results from two theoretical approaches are given: theR-matrix approach and the independent atom method with screening corrected additivity rule and interference terms. Where a comparison between our experimental and theoretical results could be made, the level of accord varied from being quite good to marginal depending on the actual scattering process under consideration. Last, a comparison between the present elastic DCS results and those from our earlier study on positron scattering from pyrimidine [Palihawadana , Phys. Rev. A 88, 012717 (2013)PLRAAN1050-294710.1103/PhysRevA.88.012717] showed a somewhat unexpected level of agreement.
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