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Ultra-fast three and four-electron dynamics in intense electro-magnetic laser fields

强电磁激光场中的超快三电子和四电子动力学

基本信息

批准号：
EP/W005352/1
负责人：
Agapi Emmanouilidou
金额：
$ 54.9万
依托单位：
University College London
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2021
资助国家：
英国
起止时间：
2021 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FW005352%2F1
关键词：
Ultra fast three four electron

项目摘要

Ultra-short and ultra-intense laser pulses provide an impressive camera into the world of electron motion. Attoseconds and sub-femtoseconds are the natural time scale of multi-electron dynamics during the ionization and break-up of atoms and molecules. The overall aim of the proposed work is to investigate attosecond phenomena, pathways of correlated electron dynamics and effects due to the magnetic field of light in three and four-electron ionization in atoms and molecules triggered by intense near-infrared and mid-infrared laser pulses. Correlated electron dynamics is of fundamental interest to attosecond technology. For instance, an electron extracted from an atom or molecule carries information for probing the spatio-temporal properties of an ionic system with angstrom resolution and attosecond precision paving the way for holography with photoelectrons. Moreover, studies of effects due to the magnetic field of light in correlated multi-electron processes are crucial for understanding a variety of chemical and biological processes, such as the response of driven chiral molecules. Chiral molecules are not superimposable to their mirror image and are of particular interest, since they are abundant in nature. The proposed research will explore highly challenging ultra-fast phenomena involving three and four-electron dynamics and effects due to the magnetic field of light in driven atoms and during the break-up of driven two and three-center molecules. We will investigate the physical mechanisms that underly these phenomena and devise schemes to probe and control them. Exploring these ultra-fast phenomena constitutes a scientific frontier due to the fast advances in attosecond technology. These fundamental processes are largely unexplored since most theoretical studies are developed in a framework that does not account for the magnetic field of light. Moreover, correlated three and four-electron escape is currently beyond the reach of quantum mechanical techniques. Hence, new theoretical tools are urgently needed to address the challenges facing attoscience. In response to this quest, we will develop novel, efficient and cutting-edge semi-classical methods that are much faster than quantum-mechanical ones, allow for significant insights into the physical mechanisms, compliment experimental results and predict novel ultra-fast phenomena. These semi-classical techniques are appropriate for ionization processes through long-range Coulomb forces. Using these techniques, we will address some of the most fundamental problems facing attoscience. Our objectives are:1) Identify and time-resolve novel pathways of correlated three-electron dynamics in atoms driven by near-infrared and mid-infrared laser pulses.2) Explore effects due to the magnetic field of light in correlated two and three-electron escape during ionization in atoms as well as in two and three-center molecules driven by near-infrared and mid-infrared laser pulses that are either linearly or elliptically polarized or by vector beams, i.e. "twisted" laser fields, an intriguing form of light that twists like a helical corkscrew.3) Control correlated multi-electron ionization and the formation of highly exited Rydberg states in four-active-electron three-center molecules by employing two-color laser fields or vector beams.

超短超强激光脉冲为电子运动的世界提供了一个令人印象深刻的相机。阿秒和亚飞秒是原子和分子电离和分裂过程中多电子动力学的自然时间尺度。拟议工作的总体目标是研究阿秒现象，相关的电子动力学的路径和由于光磁场的影响，在三个和四个电子电离的原子和分子由强近红外和中红外激光脉冲触发。关联电子动力学是阿秒技术的基础。例如，从原子或分子中提取的电子携带着用于以埃分辨率和阿秒精度探测离子系统时空特性的信息，为光电子全息术铺平了道路。此外，由于光的磁场在相关的多电子过程中的影响的研究是至关重要的理解各种化学和生物过程，如驱动手性分子的响应。手性分子不能与它们的镜像重叠，并且特别令人感兴趣，因为它们在自然界中丰富。拟议的研究将探索极具挑战性的超快现象，涉及三电子和四电子动力学以及受驱动原子中的光磁场以及受驱动的两中心和三中心分子分裂期间的效应。我们将研究这些现象背后的物理机制，并设计方案来探测和控制它们。由于阿秒技术的快速发展，探索这些超快现象构成了科学前沿。这些基本过程在很大程度上是未被探索的，因为大多数理论研究都是在不考虑光的磁场的框架中发展的。此外，相关的三电子和四电子逃逸目前超出了量子力学技术的范围。因此，迫切需要新的理论工具来应对attoscience面临的挑战。为了响应这一要求，我们将开发新的，有效的和尖端的半经典方法，比量子力学方法快得多，允许对物理机制的重要见解，补充实验结果并预测新的超快现象。这些半经典技术适用于通过长程库仑力的电离过程。使用这些技术，我们将解决一些最基本的问题所面临的attoscience。我们的目标是：1）识别和时间分辨由近红外和中红外激光脉冲驱动的原子中的相关三电子动力学的新路径。2）探索由于光的磁场在原子以及由线性或椭圆偏振的近红外和中红外激光脉冲或由矢量光束（即“扭曲”激光场）驱动的两中心和三中心分子中的电离期间的相关两电子和三电子逃逸中的效应，一种有趣的光的形式，像螺旋开瓶器一样扭曲。3）通过使用两个-彩色激光场或矢量光束。