| Theoretical Analysis of Generalized Oscillator Strengths for Helium by R-Matrix Method |
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| 作者姓名： | 韩小英 李家明 |
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| 作者单位： | CenterforAtomicandMolecularNanosciences,DepartmentofPhysics,TsinghuaUniversity,Beijing100084 |
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| 摘 要： | The high-energy electronic-impact excitation cross section is directly proportional to the generalized oscillators trength (GOS) of the target atom. The generalized oscillator strengths of helium atom from the ground state to the excited states (2^1S, 2^1P and 3^1D) are calculated using the updated R-matrix codes within the first Born approximation. Our calculation results are in good agreement with the previous theoretical and experimental results at high incident energies. In order to treat the bound-bound and bound-continuum transitions in a unified manner, the GOS density is defined based on the quantum defect theory. We calculate the GOS densities of ^1S, ^1p and ^1D charmels, namely the complete high-energy collision cross sections of electronic-impact excitations into all the n^1S, n^1P and n^1D excited states. In addition to high-energy excitation cross sections, a scheme to calculate the excitation cross sections for entire incident energy range is discussed.
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| 关 键 词： | 激励截面 理论分析 氦原子 高能电子碰撞 等离子体物理 辐射物理学 基态 |
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