标题： 从时间依赖的瞬态吸收光谱中提取类似RABBITT的相位信息 显示英文标题

标题： Extracting RABBITT-like phase information from time-dependent transient absorption spectra

摘要： 我们探讨了阿托秒脉冲序列的光谱相位如何影响瞬态吸收（TA）光谱中的光学截面。 极端紫外（XUV）和时间延迟的近红外（NIR）场与原子或分子系统的相互作用决定了动力学过程。 正如在RABBITT实验中已经展示的那样，XUV脉冲的光谱相位可以从光电子电离谱中作为时间延迟的函数提取出来。 同样，这种XUV相位会体现在与延迟相关的光学截面振荡上。 通过微扰解析方法，并在少能级模型中模拟量子动力学，以及通过求解氢原子的时间依赖薛定谔方程，我们揭示了RABBITT和TA光谱中的光谱相位之间的相似性。 显示英文摘要

摘要： We explore how the spectral phase of atto\-second pulse trains influences the optical cross section in transient absorption (TA) spectroscopy. The interaction of extreme ultraviolet (XUV) and time-delayed near-infrared (NIR) fields with an atomic or molecular system governs the dynamics. As already shown in RABBITT experiments, the spectral phase of the XUV pulses can be extracted from the photoionization spectrum as a function of the time delay. Similarly, this XUV phase imprints itself on delay-dependent optical cross-section oscillations. With a perturbative analytical approach and by simulating the quantum dynamics both in a few-level model and via solving the time-dependent Schr\"odinger equation for atomic hydrogen, we reveal the similarity between the spectral phase in RABBITT and TA spectroscopy.