标题： 软X射线区域中阿秒脉冲的表征 显示英文标题

标题： Characterization of attosecond pulses in the soft x-ray regime

摘要： 阿秒X射线脉冲为探测和触发新型超快运动提供了前所未有的机会。 与此同时，X射线脉冲的表征提出了在紫外波段不存在的新挑战。 内壳层电离是X射线的主要电离机制，随后会伴随荧光、俄歇衰变和激发等次级过程。一般来说，我们发现内壳层电离和次级过程可以产生额外的延迟依赖调制，这将影响脉冲重建方案。 我们最近提出的脉冲表征方法[Pabst和Dahlström，PRA 94，013411（2016）]，其中束缚电子波包被阿秒脉冲依次光致电离，可以适应这些效应的影响，从而在X射线波段开辟了可靠的脉冲重建途径。 显示英文摘要

摘要： Attosecond x-ray pulses offer unprecedented opportunities for probing and triggering new types of ultrafast motion. At the same time, pulse characterization of x-rays presents new challenges that do not exist in the UV regime. Inner-shell ionization is the dominant ionization mechanism for x-rays and it is followed by secondary processes like fluorescence, Auger decay, and shake-up.In general, we find that inner-shell ionization and secondary processes can create additional delay-dependent modulations that will affect pulse reconstruction schemes. Our recently proposed pulse characterization method [Pabst and Dahlstr\"om, PRA 94, 013411 (2016)], where a bound electron wavepacket is sequentially photoionized by the attosecond pulse, can be adapted to mitigate the impact of these effects, thus opening up an avenue for reliable pulse reconstruction in the x-ray regime.