Energy and momentum spectra of photoelectrons under conditions of ionization by strong laser radiation (The case of elliptic polarization)
Energy and momentum spectra of photoelectrons under conditions of ionization by strong laser radiation (The case of elliptic polarization)
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DOI：
10.1134/1.1378169
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发表时间：
2001-05
影响因子：
1.1
通讯作者：
V. Mur;S. Popruzhenko;V. S. Popov
中科院分区：
文献类型：
--
作者：
V. Mur;S. Popruzhenko;V. S. Popov
本文对椭圆偏振激光辐射电离原子和分子过程中产生的光电子的动量分布和能谱进行了解析和数值研究。本文讨论了这些分布与电磁波椭圆率的关系，以及它们随Keldysh参数γ从光隧穿区（γ ε 1）到γ ε 1区（其中电离是多光子的）变化的演化。计算中采用了准经典近似，特别是时间近似法和鞍点近似法。
Analytical and numerical studies are made into the momentum distribution and energy spectra of photoelectrons emitted during nonlinear ionization of atoms and molecules by laser radiation with elliptic polarization. The dependence of these distributions on the ellipticity ξ of an electromagnetic wave is treated, as well as their evolution upon variation of the Keldysh parameter γ from the region of optical tunneling (γ≪1) to the region of γ≫1, in which the ionization is multiphoton. The quasiclassical approximation is used in the calculations, in particular, the imaginary-time method and the saddle-point method with expansion in the vicinityof the field ellipse.