THEORY OF BARRIER-SUPPRESSION IONIZATION OF ATOMS
THEORY OF BARRIER-SUPPRESSION IONIZATION OF ATOMS
复制标题
原子势垒抑制电离理论
DOI：
10.1142/s0218863595000343
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发表时间：
1995
影响因子：
2.7
通讯作者：
V. Krainov
中科院分区：
文献类型：
--
作者：
V. Krainov
到目前为止，对原子（离子）受外电磁辐射电离的理论描述涉及两种可供选择的情况：多光子电离和隧道电离。对于这两种情况，当激光场强度不太强时，描述电离几率的公式是众所周知的。然而，如果电场很强，则存在一个新的通道;所谓的势垒抑制（或势垒以上）原子电离。这个过程是如何发生的？很明显，当场强F在势垒抑制场FBSI附近变化时，低频激光场的势垒抑制电离和势垒下隧穿电离会平滑地相互转化。本文回顾了在过去几年中开发的各种理论方法，特别是分析方面的考虑。本文还导出了一些新的电离率、电子能量和角分布的半解析表达式。
The theoretical description of the ionization of an atom (ion) by external electromagnetic radiation up to now concerned two alternative situations; multiphoton ionization and tunneling ionization. For both cases the formulas describing the ionization probability when the intensity of the laser field is not too strong are well known. However, if the field is strong, then there exists a new channel; the so-called barrier-suppression (or above-barrier) ionization of the atom. How does this process occur? It is obvious that barrier-suppression ionization and sub-barrier tunneling ionization by low-frequency laser field transform smoothly into one another as the field strength F is varied near the value of the barrier-suppression field FBSI. This paper contains a review of various theoretical approaches developed during the last few years, especially analytical considerations. Some new semi-analytical expressions for ionization rates, energy and angular distributions of ejected electrons are also derived.