强极化靶的光电离
Photoionization of a strongly polarizable target
摘要：
我们证明，从一个强极化的目标暴露于激光场的光电子的角分布可以明显偏离传统理论的预测。即使在偶极-光子近似下，由于激光场在残基处诱导的交变偶极矩场的作用，分布的轮廓也被修改。这种效应对残余物的动态极化率及其几何形状非常敏感，也取决于激光场的强度和频率。数值计算结果表明，钠簇阴离子，发生戏剧性的变化的配置文件的光子能量附近的等离子体共振，其中的效果是增强由于剩余极化率的增加。单光子电离过程的特性的强烈改变可以通过施加相对低强度$I_0 \sim10^{10}-10^{11}$ W/cm $^2$的激光场来实现。
英文摘要：
We demonstrate that the angular distribution of photoelectrons from a strongly polarizable target exposed to a laser field can deviate noticeably from the prediction of conventional theory. Even within the dipole-photon approximation the profile of distribution is modified due to the action of the field of alternating dipole moment induced at the residue by the laser field. This effect, being quite sensitive to the dynamic polarizability of the residue and to its geometry, depends also on the intensity and frequency of the laser field. Numerical results, presented for sodium cluster anions, demonstrate that dramatic changes to the profile occur for the photon energies in vicinities of the plasmon resonances, where the effect is enhanced due to the increase in the residue polarizability. Strong modifications of the characteristics of a single-photon ionization process can be achieved by applying laser fields of comparatively low intensities $I_0 \sim10^{10}-10^{11}$ W/cm$^2$.
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