软X射线强场电离的含时密度泛函理论
Time-Dependent Density-Functional Theory of Strong-Field Ionization of Atoms under Soft X-Rays
摘要：
我们展示了强场，短波长（软X射线）物理的时间相关的密度泛函理论（TDDFT）的能力，相比基于速率方程的形式主义。我们发现，TDDFT提供了一个很好的描述的总的和个人的Ne和Ar原子暴露于强激光脉冲的电离产额。我们评估不同的绝热密度泛函的可靠性，并得出结论，远程相互作用的交换和相关电位的准确描述是至关重要的，以获得正确的电离产率在很宽的强度范围内（$10^{13}$ -$5 \times 10^{15}$ W/cm $^2$）。我们的TDDFT计算解开从每个电离通道的Kohn-Sham波函数的基础上的贡献。
英文摘要：
We demonstrate the capabilities of time-dependent density functional theory (TDDFT) for strong-field, short wavelength (soft X-ray) physics, as compared to a formalism based on rate equations. We find that TDDFT provides a very good description of the total and individual ionization yields for Ne and Ar atoms exposed to strong laser pulses. We assess the reliability of different adiabatic density functionals and conclude that an accurate description of long-range interactions by the exchange and correlation potential is crucial for obtaining the correct ionization yield over a wide range of intensities ($10^{13}$ -- $5 \times 10^{15}$ W/cm$^2$). Our TDDFT calculations disentangle the contribution from each ionization channel based on the Kohn-Sham wavefunctions.
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