Density dependence of the atomic transition probabilities in hot, dense plasmas.
Density dependence of the atomic transition probabilities in hot, dense plasmas.
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DOI：
10.1103/physreva.35.807
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发表时间：
1987-01
期刊：
影响因子：
--
通讯作者：
Salzmann;Szichman
中科院分区：
文献类型：
--
作者：
Salzmann;Szichman
研究了高电离态铝在高温稠密等离子体中的原子性质和跃迁几率。特别是，我们目前的计算结果与密度的以下原子参数：原子势和屏蔽因子（由于绑定和自由电子），自由电子分布，原子波函数，结合能，线位移，最后，跃迁概率和振子强度的变化。计算是使用电离层模型（ISM）进行的，该模型将原子中的束缚电子和自由电子自洽地置于中心势中。这种电势是由核库仑场与束缚和自由电子电荷分布的贡献相结合产生的。结果表明，随着等离子体密度的增加，等离子体对原子性质的影响越来越大。特别地，自由电子屏蔽降低了原子势，将原子波函数推离原子核，并降低了束缚电子的结合能。跃迁几率也随着密度单调下降，直到上态的电离极限，超过电离极限跃迁几率降为零。计算结果进行了比较，从一个均匀的自由电子空间分布的预期。
The atomic properties and transition probabilities of highly ionized aluminum in hot, dense plasmas were studied. In particular, we present computational results of the variations with density of the following atomic parameters: atomic potential and screening factor (due to both bound and free electrons), free-electron distribution, atomic wave functions, binding energies, line shifts, and, finally, transition probabilities and oscillator strengths. The calculations were carried out using the ion-sphere model (ISM) which treats the bound and free electrons in the atom self-consistently in a central potential. This potential is produced by the combination of the nuclear Coulomb field together with contributions by the bound- and free-electron charge distributions. The results indicate an increasing effect of the plasma on the atomic properties with increasing plasma density. Particularly, the free-electron screening reduces the atomic potential, pushes the atomic wave functions away from the nucleus, and reduces the binding energy of the bound electrons. The transition probability also decreases monotonically with density up to the ionization limit of the upper state beyond which it drops to zero. The computational results are compared to those expected from a homogeneous free-electron spatial distribution.