Study of molecules and clusters in intense laser fields using the quantum trajectory-based Coulomb-corrected strong-field approximation

原子或分子与强激光脉冲的相互作用需要一个超越传统微扰理论的理论描述。在强场近似中，激光场一直被忽略到电离时间，而电离后电子与离子之间的库仑相互作用被忽略。然而，事实证明，许多实验观察到的或通过含时薛定谔方程的精确解发现的光电子谱的性质是由于库仑效应，因此无法使用SFA。我们已经开发了一个库仑校正的SFA依赖于所谓的量子轨道。通过这种方式，光电子谱的任何特征都可以用干涉量子轨迹来解释-这相当于对量子动力学的最大洞察。在拟议的项目中，我们希望扩展该方法并将其应用于更复杂的系统，如分子和团簇。

The interaction of atoms or molecules with intense laser pulses requires a theoretical description beyond conventional perturbation theory. In the widely applied strong field approximation (SFA) the laser field is neglected up to the ionization time while the Coulomb interaction between electron and ion is neglected after the ionization. However, it turned out that many of the experimentally observed or via the exact solution of the time-dependent Schrödinger equation found properties of photoelectron spectra are due to Coulomb effects, and thus are not accessible to the SFA. We have developed a Coulomb correction to the SFA which relies on so-called quantum orbits. In this way, any feature of photoelectron spectra may be interpreted in terms of interfering quantum trajectories - which amounts to maximum insight into quantum dynamics. In the proposed project, we want to extend the method and apply it to more complex systems such as molecules and clusters.