Laser诱导的XUV自由感应衰变电子波包的相位分辨二维谱
Phase-Resolved Two-Dimensional Spectroscopy of Electronic Wavepackets by Laser-Induced XUV Free Induction Decay
摘要：
我们提出了一种新的时间和相位分辨，无背景的计划来研究极紫外偶极子发射的束缚电子波包，而不使用任何极紫外激发脉冲。利用多光子跃迁，我们填充了一个叠加的量子态，这些量子态通过自由感应衰减相干地发射极紫外辐射。这种发射的探测和控制，无论是在振幅和相位，由一个时间延迟的红外飞秒脉冲。我们直接测量的激光诱导的退相的发射，通过使用一个简单的外差检测方案的基础上的两个源的干涉。这种技术提供了丰富的信息之间的相互作用的激光场和库仑势的激发电子动力学。它的无背景性质使我们能够使用大范围的气体压力，并揭示碰撞在弛豫过程中的影响。
英文摘要：
We present a novel time- and phase-resolved, background-free scheme to study the extreme ultraviolet dipole emission of a bound electronic wavepacket, without the use of any extreme ultraviolet exciting pulse. Using multiphoton transitions, we populate a superposition of quantum states which coherently emit extreme ultraviolet radiation through free induction decay. This emission is probed and controlled, both in amplitude and phase, by a time-delayed infrared femtosecond pulse. We directly measure the laser-induced dephasing of the emission by using a simple heterodyne detection scheme based on two-source interferometry. This technique provides rich information about the interplay between the laser field and the Coulombic potential on the excited electron dynamics. Its background-free nature enables us to use a large range of gas pressures and to reveal the influence of collisions in the relaxation process.
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