论文标题
我们可以测量光电离实验中的Wigner时间延迟吗？
Can we measure the Wigner time delay in a photoionization experiment?
论文作者
论文摘要
储层计算是预测湍流的有力工具，其简单的架构具有处理大型系统的计算效率。然而，其实现通常需要完整的状态向量测量和系统非线性知识。我们使用非线性投影函数将系统测量扩展到高维空间，然后将其输入到储层中以获得预测。我们展示了这种储层计算网络在时空混沌系统上的应用，该系统模拟了湍流的若干特征。我们表明，使用径向基函数作为非线性投影器，即使只有部分观测并且不知道控制方程，也能稳健地捕捉复杂的系统非线性。最后，我们表明，当测量稀疏、不完整且带有噪声，甚至控制方程变得不准确时，我们的网络仍然可以产生相当准确的预测，从而为实际湍流系统的无模型预测铺平了道路。
No, we cannot! The concept of Wigner time delay was introduced in scattering theory to quantify the delay or advance of an incoming particle in its interaction with the scattering potential. It was assumed that this concept can be transferred to ionization considering it as a half scattering process. In the present work we show, by analyzing the corresponding wave packets, that this assumption is incorrect since the wave function of the liberated particle has to satisfy the incoming-wave boundary condition. We show that the electron released in photoionization carries no imprint of the scattering phase and thus cannot be used to determine the Wigner time delay. We illustrate our conclusions by comparing the numerical results obtained using two different methods of extracting the photoelectron spectra in an attoclock experiment.
