报告题目：Ultrafast Molecular Frame Electronic Coherences from Time-resolved Lab Frame Scattering Anisotropies
报告人：Prof. Albert Stolow
主持人：吴健教授
时间：2021年3月23日上午9：00
地点：光学大楼B325会议室
报告人简介：
Albert Stolow is the Canada Research Chair in Molecular Photonics and Professor of Physics & Chemistry at the University of Ottawa. He founded the Molecular Photonics Group within the National Research Council Canada where he maintains an ongoing collaborative research program. He is Adjunct Professor of Chemistry and of Physics at Queen’s University in Kingston. Stolow is also a Fellow of the Max-Planck-uOttawa Centre for Extreme and Quantum Photonics. His research interests include ultrafast molecular dynamics, quantum control, strong field physics of polyatomic molecules, and coherent non-linear optical microscopy.
Albert Stolow studied at Queen’s University and then obtained his Ph.D. degree in Chemical Physics from the University of Toronto in 1988, under Nobel Laureate John C. Polanyi. Stolow was an NSERC post-doctoral fellow at the University of California, Berkeley from 1989-1992 where he worked with Nobel Laureate Yuan T. Lee. In fall 1992, Stolow joined the National Research Council in Ottawa, rising to the position of Group Leader and Principal Research Officer. In 2014, he assumed the Canada Research Chair in Molecular Photonics at the University of Ottawa. Stolow is a Fellow of both the American Physical Society (2008) and the Optical Society of America (2009). He has won several national prizes including the Earle K. Plyler Prize of the American Physical Society, the Polanyi Award of the Canadian Society for Chemistry, the Queen Elizabeth II Diamond Jubilee Medal (Canada), the Laidler Award of the Canadian Society for Chemistry, and the Barringer Award of the Spectroscopy Society of Canada. Stolow sits on the editorial boards of numerous international journals and on the Advisory Boards of several international research institutions. Stolow is currently Chair of the American Physical Society’s Division of Chemical Physics (DCP) and past-Member of the Executive Committee of the American Physical Society’s Division of Laser Science (DLS).
报告内容简介：
Electronic dynamics in molecules underlies many important physical processes including Vision, Photosynthesis and Solar Energy Conversion. The non-adiabatic coupling between electronic and vibrational dynamics is the fundamental physics governing these and, in fact, photo-induced charge transfer or charge rearrangement processes in general[1,2]. Electronic population dynamics and electronic coherences induced by nuclear motion were described by a 2018 U.S. Department of Energy report as a ‘grand challenge’ for Molecular Physics. Time-Resolved Photoelectron Spectroscopy (TRPES) [3] and Time-Resolved Photoelectron Angular Distributions (TRPADS) [4,5,6] are two approaches which address these problems. However, the separation of electronic coherences from populations remains very difficult and, to date, has only been addressed by 2D Electronic Spectroscopy. Here we present a new approach based on ultrafast time-resolved scattering anisotropies which allows complete separation of electronic coherences from electronic population dynamics[7]. It is based on analyzing higher moments of the Lab Frame scattering anisotropies. We present the basic ideas and first experimental demonstration using the ultrafast scattering technique of time-energy-angle-resolved photoelectron spectroscopy. We emphasize that this fundamental approach applies to any angle-resolved Lab Frame Scattering method on any time scales, including Ultrafast Electron and X-ray Scattering, and is therefore well suited to both Attosecond and Femtosecond Time-resolved Scattering measurements.
[1] Annual Review of Physical Chemistry 69, 427 (2018)
[2] Physical Review Letters 120, 243001 (2018)
[3] Advances in Chemical Physics 139, 497 (2008)
[4] Science 311, 219 (2006)
[5] Science 323, 1464 (2009)
[6] Nature Physics 7, 612 (2011)
[7] J.Phys.B. 53 114001 (2020)