Resonance scattering of positronium atoms by nitrogen molecules

Resonance scattering of positronium atoms by nitrogen molecules
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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:
Molecular and Optical Physics
影响因子:
--
通讯作者:
Fabrikant, I I
Fabrikant, I I
中科院分区:
--
文献类型:
--
作者:
Wilde, R S;Fabrikant, I I

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从理论上研究了正电子偶素(Ps)原子与氮分子的共振散射,并与电子偶素对称下的e-N2共振散射进行了比较. Ps-N2共振在E-N2、E-N2和Δ g对称中的速度位置与e-N2共振的速度位置非常接近,这导致当两者都被绘制为弹丸速度的函数时,总Ps-N2截面与e-N2截面非常相似。然而,在Ps-N 2的情况下,共振更广泛,其位置变化慢得多,增加核间的距离比e-N 2的情况。这使得Ps碰撞振动激发截面远小于电子碰撞振动激发截面,并且在Ps-N2散射中没有观察到回飞棒振荡。我们分析了静电势在电子-N2的情况下的作用,并比较电子-N2和Ps-N2相互作用的交换势。这种分析使我们能够解释这两种情况下振动动力学的差异。
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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