Dynamics of photoionization of hydrogenlike ions in Debye plasmas
Dynamics of photoionization of hydrogenlike ions in Debye plasmas
复制标题
德拜等离子体中类氢离子光电离的动力学
DOI：
10.1103/physreva.80.063404
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发表时间：
2009-12
影响因子：
2.9
通讯作者：
Janev, R. K.
中科院分区：
文献类型：
--
作者：
Qi, Y. Y.;Wang, J. G.;Janev, R. K.
研究了嵌入在弱耦合等离子体中的类氢离子基态和n<=3激发态的光离过程。用Debye-Hueckel模型描述了带电粒子间库仑相互作用的等离子体筛选。用辛积分器对薛定谔方程进行数值求解，得到了束缚态和连续态的能级和波函数。库仑相互作用的筛选减少了束缚电子态的数量，降低了束缚电子态的结合能，拓宽了这些状态的电子波函数的径向分布，并显著改变了连续波函数的相位和振幅。这些变化强烈影响束缚态和连续态之间的偶极矩阵元素，从而影响光电离截面。筛选库仑相互作用对光电离截面能量行为的最显著影响表现在其低能量行为（Wigner阈值定律），当筛选的临界强度达到一定程度后，上界态的能级进入连续体时出现多个形状和虚拟态共振，以及在高光子能量时截面的（轻微）缩小。这些特征都与德拜-休克尔势的近程特性有关。研究了电势筛选对光离截面comet - farnoux和Cooper最小值的影响。将计算得到的光电离截面与其他作者的结果进行了比较。«少
Photoionization processes for the ground state and n<=3 excited states of hydrogenlike ions embedded in a weakly coupled plasma are investigated in the entire energy range of a nonrelativistic regime. The plasma screening of the Coulomb interaction between charged particles is described by the Debye-Hueckel model. The energy levels and wave functions for both the bound and continuum states are calculated by solving the Schroedinger equation numerically by the symplectic integrator. The screening of Coulomb interactions reduces the number of bound electron states, decreases their binding energies, broadens the radial distribution of electron wave functions of these states, and changes significantly the phases and the amplitudes of continuum wave functions. These changes strongly affect the dipole matrix elements between the bound and continuum states and, hence, the photoionization cross sections. The most significant effects of the screened Coulomb interactions on the energy behavior of photoionization cross sections are manifested in its low-energy behavior (Wigner threshold law), the appearance of multiple shape and virtual-state resonances when the energy levels of upper bound states enter the continuum after certain critical strength of the screening, and in the (slight) reduction of the cross section at high photon energies. All these features of themore » photoionization cross section are related to the short-range character of the Debye-Hueckel potential. The effects of the potential screening on the Combet-Farnoux and Cooper minima in the photoionization cross section are also investigated. Comparison of calculated photoionization cross sections with the results of other authors, when available, is made.« less
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影响因子：
--
作者：
S. Manson
通讯作者：
S. Manson
DOI：
10.1016/s0097-8485(96)00017-4
发表时间：
1997
期刊：
Comput. Chem.
影响因子：
--
作者：
T. Simos
通讯作者：
T. Simos
DOI：
10.1088/0022-3700/16/18/003
发表时间：
1983-09
期刊：
Journal of Physics B
影响因子：
--
作者：
N. Avdonina;M. Amusia
通讯作者：
N. Avdonina;M. Amusia
影响因子：
8.6
作者：
A. Msezane;S. Manson
通讯作者：
A. Msezane;S. Manson
DOI：
10.1103/physreva.42.5348
发表时间：
1990-11
期刊：
Physical review. A, Atomic, molecular, and optical physics
影响因子：
--
作者：
Tong;Li;Pratt
通讯作者：
Tong;Li;Pratt