优化脉冲X射线喇曼散射研究原子系统中的布居转移
Optimizing impulsive X-ray Raman scattering for population transfer in atomic systems
摘要：
用多组态含时Hartree-Fock方法计算了锂、氖和钠的脉冲X射线喇曼激发。利用无啁啾的线偏振激光脉冲，我们确定了最大布居数转移到价态激发态的最佳中心频率、强度和持续时间。我们证明了存在两个局部最优或“甜蜜点”的人口转移，其中任何一个，根据系统，可能是优越的。对于某些系统，我们发现，人口转移可以最大限度地通过非共振拉曼跃迁，红失谐低于K边，因为这种失谐最大限度地减少核心激发的人口和电离损失。例如，在K边附近的氖中，布居转移的全局最佳值出现在高强度（8 $\times$ 10 $^{19}$ W cm $^{-2}$）、短持续时间（82 as半峰全宽）和24 eV的K边红色失谐处。
英文摘要：
Impulsive X-ray Raman excitations of Lithium, Neon, and Sodium are calculated using the Multiconfiguration Time-Dependent Hartree-Fock method. Using linearly polarized laser pulses without chirp, we determine the optimum central frequency, intensity, and duration for maximum population transfer to valence excited states. We demonstrate the existence of two local optima or "sweet spots" for population transfer, either of which, depending on the system, may be superior. For some systems we find that population transfer can be maximized by nonresonant Raman transitions, red-detuned below K-edge, because such detuning minimizes core-excited populations and ionization loss. For instance, in Neon near the K-edge the global optimum for population transfer occurs at high intensity (8 $\times$ 10$^{19}$ W cm$^{-2}$), short duration (82as full-width-at-half-maximum), and 24eV red-detuned from the K-edge.
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