Weak-field asymptotic theory of tunneling ionization in many-electron atomic and molecular systems
Weak-field asymptotic theory of tunneling ionization in many-electron atomic and molecular systems
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DOI：
10.1103/physreva.89.013421
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发表时间：
2014-01
影响因子：
2.9
通讯作者：
O. Tolstikhin;L. Madsen;T. Morishita
中科院分区：
文献类型：
--
作者：
O. Tolstikhin;L. Madsen;T. Morishita
均匀静电场中隧道电离的弱场渐近理论[Tolstikhinet等人，Phys. Rev. A 84，053423（2011）PLRAAN 1050 -294710.1103/PhysRevA.84.053423]扩展到在冷冻核近似下处理的多电子原子和分子系统。得到了电离率场值渐近展开式中的首阶项。所得公式表示未扰动系统的性质项。与单电子情形（本理论的多电子性质通过单电子情形揭示出来）最本质的区别在于，给定电离通道的结构因子（定义进入该通道的电离速率对系统相对于场的取向的依赖性）由相应的戴森轨道决定。通过对几个少电子系统的计算，说明了该理论。渐近结果进行了比较，在文献中提供的隧道电离率的准确的完全相关的计算。
The weak-field asymptotic theory of tunneling ionization in an external static uniform electric field [Tolstikhinet al., Phys. Rev. A 84, 053423 (2011)PLRAAN1050-294710.1103/PhysRevA.84.053423] is extended to many-electron atomic and molecular systems treated in the frozen-nuclei approximation. The leading-order term in the asymptotic expansion of the ionization ratein the value of the fieldforis obtained. The resulting formulas expressin terms of properties of the unperturbed system. The most essential difference from the one-electron case, through which the many-electron character of the present theory reveals itself, is that the structure factor for a given ionization channel, defining the dependence of the ionization rate into this channel on the orientation of the system with respect to the field, is determined by the corresponding Dyson orbital. The theory is illustrated by calculations for several few-electron systems. The asymptotic results are compared with accurate fully correlated calculations of tunneling ionization rates available in the literature.