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The double differential cross sections for electron impact ionization of helium at incident energies of 200 eV, 100 eV and 64.6 eV have been calculated in the BBK model. The present results are found to be in generally good agreement with the latest measurements of R?der et al. and the theoretical results of the convergent close-coupling method although some quantitative discrepancy remains. 相似文献
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利用标准一阶扭曲波玻恩近似方法(DWBA)计算了共面双对称几何条件下不同能量电子碰撞电离Ne原子的三重微分截面(TDCS),与Nixon和Murray[1]最新的实验测量数据进行比较.当入射电子能量较低时,理论计算结果和实验数据符合较差;而随着入射电子能量的增加,符合程度逐渐改善. 相似文献
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The triple differential cross sections for the ionization of helium from its ground state 11S and metastable states 21S and 23S in coplanar asymmetric geometry by 150, 250 and 400 eV electrons have been calculated in the BBK model. The present results are compared with the experimental data and/or the other theoretical ones. It has been found that the structures for the metastable states differ markedly from those for the ground state. The collision mechanisms for the new structures appearing in the cross sections for the ionization from metastable states have been analysed. And it has been shown how the intensity of recoil peak changes due to the size of the electron orbital. In addition, the optimal kinematical situations for the cross sections are explored for future experiment. 相似文献
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The DS3C model has been improved by taking into account the final channel screening effects. The triple differential cross sections for electron impact ionization of helium at an incident energy of 40 eV are considered. The results of the present DS3C model are compared with the absolute measurements and those of other theoretical models. It has also been shown in which situation the exchange effects are crucial. 相似文献
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The effect of wave function orthogonality on the simultaneous ionization and excitation of helium 下载免费PDF全文
Within the framework of the first-order Born approximation, the triple differential cross sections (TDCSs) for simultaneous ionization and excitation of helium are calculated. The wave function of the ejected electron is chosen to be orthogonal or non-orthogonal to the wave function of the bound electron before ionization. It is found that the orthogonality has a strong effect on the TDCS, especially when plane waves and Coulomb waves are used to describe the projectile and the ejected electron. 相似文献
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在电子碰撞He原子同时电离同时激发的(e, 2e)反应中,利用DWBA模型,考虑了入射通道基态He原子两种不同的初态波函数,计算了He原子同时电离激发反应的三重微分截面(TDCS),并与实验数据进行比较。结果表明,有关联的Sliverman波函数计算得到的TDCS与实验数据吻合的更好点。 相似文献
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在电子碰撞He原子同时电离同时激发的(e,2e)反应中,利用DWBA模型,考虑了入射通道基态He原子两种不同的初态波函数,计算了He原子同时电离激发反应的三重微分截面(TDCS),并与实验数据进行比较.结果表明,有关联的Silverman波函数计算得到的TDCS与实验数据吻合的更好点. 相似文献