Electron-impact excitation of hydrogenic ions in dense plasmas.
Electron-impact excitation of hydrogenic ions in dense plasmas.
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DOI：
10.1063/1.871440
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
Young-Dae Jung
中科院分区：
文献类型：
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作者：
Young-Dae Jung
研究了等离子体屏蔽效应对稠密等离子体中类氢离子电子碰撞激发的半经典跃迁几率的影响。在德拜长度Λ/aZ≥10的感兴趣区域，用屏蔽库仑相互作用的非球Debye-Huckel模型计算了电子-离子相互作用势.用半经典直线轨道方法描述了入射电子的行为，屏蔽效应随入射电子能量的增加而增加。发现等离子体屏蔽效应对光学允许（偶极）跃迁（1 s → 2 p）的影响比对光学禁戒跃迁（1 s →2s）的影响更有效。对于1 s →2s跃迁，跃迁几率的最大值位置几乎不随入射能量和等离子体屏蔽效应的增加或减少而改变。而对于1 s → 2 p跃迁，随着入射能量的增加，跃迁几率的最大值位置向核外移动。
Plasma‐screening effects are investigated on semiclassical transition probabilities for electron‐impact excitation of hydrogenic ions in dense plasmas. The electron–ion interaction potential is obtained by a nonspherical Debye–Huckel model of the screened Coulomb interaction for the interesting domain of the Debye length Λ/aZ≥10. Semiclassical straight‐line trajectory method is used to describe the behavior of the projectile electron. The screening effect is increased with increasing the projectile energy. The plasma‐screening effect on the optically allowed (dipole) transition (1s→2p) is found to be more effective than that on the optically forbidden transition (1s→2s). For 1s→2s transition, the maximum position of the transition probability is almost unchanged with increasing or decreasing the projectile energy and plasma‐screening effect. However, for 1s→2p transition, the maximum position of the transition probability has receded from the nucleus as the projectile energy increases.