Resonance scattering of positronium atoms by nitrogen molecules
Resonance scattering of positronium atoms by nitrogen molecules
复制标题
氮分子对正电子素原子的共振散射
DOI:
10.1088/1361-6455/aba2ad
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Fabrikant, I I
中科院分区:
文献类型:
--
作者:
Wilde, R S;Fabrikant, I I
We study theoretically the resonance scattering of positronium (Ps) atoms by nitrogen molecules and compare it with resonance e–N 2 scattering in the Π g symmetry. The velocity positions of the Ps–N 2 resonances in Σ u, Π u, and Δ g symmetries are very close to the velocity position of the e–N 2 resonance which leads to the total Ps–N 2 cross section being very similar to the e–N 2 cross section when both are plotted as functions of the projectile velocity. However, in the Ps–N 2 case the resonances are much wider and their positions vary much slower with increasing internuclear separation than in the e–N 2 case. This makes the Ps-impact vibrational excitation cross section much smaller than the electron-impact vibrational excitation cross section, and no boomerang oscillations are observed in Ps–N 2 scattering. We analyze the role of the static potential in the e–N 2 case and compare exchange potentials for e–N 2 and Ps–N 2 interactions. This analysis allows us to explain the difference in the vibrational dynamics in these two cases.
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