XUV引发的高次谐波产生：用低于阈值能量的XUV光驱动内价电子
XUV-initiated high harmonic generation: driving inner valence electrons using below-threshold-energy XUV light
摘要：
我们提出了一个新的方案，解决的贡献，内和外价电子的XUV引发的高次谐波产生氖。通过用低能量（低于2s电离阈值）的超短XUV脉冲探测原子，2p电子被引导远离核心，而2s电子能够描述电离轨迹。通过选择性地抑制2p电子轨道，我们可以解决2s电子对高次谐波谱的贡献。我们应用经典的轨道模型来解释2s电子的贡献，这使得对该过程的直观理解成为可能。
英文摘要：
We propose a novel scheme for resolving the contribution of inner- and outer-valence electrons in XUV-initiated high-harmonic generation in neon. By probing the atom with a low energy (below the 2s ionisation threshold) ultrashort XUV pulse, the 2p electron is steered away from the core, while the 2s electron is enabled to describe recollision trajectories. By selectively suppressing the 2p recollision trajectories we can resolve the contribution of the 2s electron to the high-harmonic spectrum. We apply the classical trajectory model to account for the contribution of the 2s electron, which allows for an intuitive understanding of the process.
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