排序方式: 共有46条查询结果,搜索用时 15 毫秒
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利用四体模型计算了100 MeV/amu裸碳碰撞氦原子单电离全微分截面,发现在散射面四体模型和实验结果符合很好,但是在散射平面外与实验数据符合有较大差别. 分析了不同散射振幅对全微分截面的贡献. 结果表明在recoil峰区域附近,由于入射粒子和靶核相互作用的振幅和入射粒子和敲出电子相互作用的振幅之间的干涉所贡献的截面更接近于实验数据,特别是在垂直平面,这两振幅的干涉所形成的截面产生了实验的双峰结构. 然而,总相互作用振幅的干涉并没有呈现这个特征. 四体模型不能给出垂直平面内实验结果的特征是由于三项散射振幅的权重不同. 相似文献
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在入射光子能量为79.6 eV~139 eV范围内,利用DS3C模型计算了不同碰撞几何条件下He光双电离的三重微分截面(TDCS),并与3C模型计算结果、CCC理论结果和实验数据做了比较.表明,末态波函数动量相关效应成功地修正了3C结果,特别当入射光子能量接近阈值时,明显改善了与实验结果的符合程度. 相似文献
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考虑核间相互作用,利用修正的库仑玻恩模型(MCB-PT)计算了入射能量为16 MeV 的O7+碰撞氦单电离的全微分截面,并将计算结果与最近的实验数据和三体库仑波(3C)模型及含核间相互作用的连续扭曲波程函初态 (CDW-EIS-PT)模型所得结果进行了比较,发现MCB-PT理论结果在中间动量转移条件下binary峰的位置与实验结果符合得很好,且位于动量转移的方向上。此外,分析了扭曲效应对全微分截面的影响,表明随着动量转移的增加,扭曲效应更加明显。 相似文献
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Effect of initial-state target polarization on single ionization of helium by 1-keV electron impact 下载免费PDF全文
We report new results of triple differential cross sections for the single ionization of helium by 1-KeV electron impact at the ejection energy of 10 eV. Investigations have been made for both the perpendicular plane and the plane perpendicular to the momentum transfer geometries. The present calculation is based on the three-Coulomb wave function. Here we have also incorporated the effect of target polarization in the initial state. A comparison is made between the present calculation with the results of other theoretical methods and a recent experiment [D黵r M, Dimopoulou C, Najjari B, Dorn A, Bartschat K, Bray I, Fursa D V, Chen Z, Madison D H and Ullrich J 2008 Phys. Rev. A 77 032717]. At an impact energy of 1 KeV, the target polarization is found to induce a substantial change of the cross section for the ionization process. We observe that the effect of target polarization plays a dominant role in deciding the shape of triple differential cross sections. 相似文献
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考虑核间相互作用,利用修正的库仑玻恩模型(MCB-PT)计算了入射能量为16 MeV 的O7+碰撞氦单电离的全微分截面,并将计算结果与最近的实验数据和三体库仑波(3C)模型及含核间相互作用的连续扭曲波程函初态 (CDW-EIS-PT)模型所得结果进行了比较,发现MCB-PT理论结果在中间动量转移条件下binary峰的位置与实验结果符合得很好,且位于动量转移的方向上。此外,分析了扭曲效应对全微分截面的影响,表明随着动量转移的增加,扭曲效应更加明显。 相似文献
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基于CDS3C模型,研究了低能电子碰撞H(e,2e)反应过程.计算了能量为54.4eV的人射电子碰撞H(e,2e)反应的TDCS,将其计算结果与3C、DS3C模型所得结果与实验结果进行了比较.表明在碰撞过程中初通道存在一不可忽略的库仑场. 相似文献
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Theoretical analysis on fully differential cross sections for C~(6+)impact ionization of helium 下载免费PDF全文
Fully differential cross sections (FDCS) are calculated within a four-body model for single ionization of helium by C6+ impact at the incident energy of 100 MeV/a.u. (atomic unit). The results are compared with experimental data and other theoretical predictions. It is shown that our results are in very good agreement with experiment for three small momentum transfers in the scattering plane; however, some significant discrepancies are still present at the largest momentum transfer in both the scattering plane and the perpendicular plane. In actuality, the problem has not been explained by the theory during the last decade. Accordingly, the contributions of different scattering amplitudes to FDCS are analyzed. It is found that for the largest momentum transfer the cross section arising from a destructive interference of the three amplitudes is much smaller than the experimental data. However, the cross section due to the constructive interference of two scattering amplitudes between projectile-ionized electron interaction and projectile-passive electron interaction almost approaches the experimental data. 相似文献