应稀有同位素前沿科学中心、核科学与技术学院邀请，浙江大学林康研究员将于2023年7月22日来校进行学术交流并作报告。

 

       报告题目：Nondipole effects in strong-field ionization

       报告时间：2023年7月22日（星期六）9：30

       报告地点：二分部现物楼305报告室

 

       欢迎广大师生参加！

 

【报告摘要】

       Ultrafast lasers are a powerful and versatile tool towards the control of electronic motion, which is one of today’s grand challenges of atomic and molecular physics. On this route however, the vast majority of the works so far has neglected the influence of magnetic component of the light field and of its spatial dependence. Including these important effects beyond the so-called electric dipole approximation for understanding light-matter interactions is one of the current frontiers of physics with short laser pulses. Most recently we found that the energies of photoelectrons emitted against the light propagation direction are shifted toward higher values, while those electrons that are emitted along the light propagation direction are shifted to lower values due to the nondipole contribution (Science Advances 8, eabn7386 (2022)). More interestingly, the nondipole contribution to the envelope of the electron energy spectrum shows an opposite tendency (Phys. Rev. Lett. 128, 023201 (2021)). However, this only holds for low-energy electrons below the classical cutoff. The nondipole shift for high-energy electrons beyond the classical cutoff is found to be vastly different. We show that large-angle rescattering of the electrons strongly alters the partitioning of the photon momentum between electron and ion (Phys. Rev. Lett. 128, 113201 (2022)). As a result, the sensitivity of the nondipole shift can serve as a powerful tool to investigate electron correlation. We also solved a long-standing controversy in double ionization of xenon atoms by utilizing the nondipole effect and reveal that the double ionization proceeds via recollision-induced doubly excited states (Phys. Rev. Lett. 128, 023201 (2022)).

 

【报告人简介】

       林康，浙江大学“百人计划”研究员，博导。长期从事飞秒激光驱动的电子和核的超快动力学过程研究，具体包括强场电离过程中的非偶极效应和分子转动波包的时空成像与调控等。近年来发表SCI论文40余篇，其中第一和通讯作者12篇，包括4篇PRL、1篇PRX、1篇Nature Chemistry、1篇Nature Communications，1篇Science Advances。担任PRL等学术期刊审稿人。

稀有同位素前沿科学中心

核科学与技术学院

2023年7月14日