论文标题
关于飞秒激光脉冲对钠的选择性多光子电离：部分波分析
On the selective multiphoton ionization of sodium by femtosecond laser pulses: A partial-wave analysis
论文作者
论文摘要
研究了在激光峰强度范围内通过飞秒激光脉冲对钠的多光子电离，研究了进入过度障碍电离结构域的激光峰强度。光电子动量分布和能量光谱是通过求解时间依赖的Schroedinger方程来确定的，从该域中的激光强度的三个值来确定。计算出的光谱与Hart等人实验获得的光谱非常吻合（Phys。Rev.A 2016 93 063426）。与弗里曼共振有关的光谱峰的部分波分析表明，每个峰都是通过不同的中间状态通过不同的增强的多光子电离产生的光电子的叠加。可以证明，在特定的激光强度下，选择性电离主要通过单个中间状态发生。
Multiphoton ionization of sodium by femtosecond laser pulses of 800 nm wavelength in the range of laser peak intensities entering over-the-barrier ionization domain is studied. Photoelectron momentum distributions and the energy spectra are determined numerically by solving the time dependent Schroedinger equation for three values of the laser intensity from this domain. The calculated spectra agree well with the spectra obtained experimentally by Hart et al (Phys. Rev. A 2016 93 063426). A partial wave analysis of the spectral peaks related to Freeman resonances has shown that each peak is a superposition of the contributions of photoelectrons produced by the resonantly enhanced multiphoton ionization via different intermediate states. It is demonstrated that at specific laser intensities the selective ionization, which occurs predominantly through a single intermediate state, is possible.
