腾讯会议：192-899-648

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报告摘要：
The natural time scale of electrons in action is of the order of attoseconds (1 as =10-18 s). Recent developments of generating attosecond pulses both in the laboratories and free electron laser facilities make an intangible dream of watching electrons in action a tangible reality. The Nobel prize of physics in 2023 was awarded to this field of attosecond science. Generations of isolated attosecond pulses in the soft X-ray regime at LCLS in the USA opens a new route to measure molecular core-level photoionization time delays that occurs in the attosecond timescale [1]. Generations of two-colour attosecond pulses at LCLS opened the door to watch the electron (charge) in action in a molecule that occurs in the attosecond timescale [2]. Generating phase-coherent multi-colour pulses at FERMI, on the hand, provided a novel approach to coherently control the electronic wave-packet and to read out the photoionization phase [3]. The talk will also address the titled study with laboratory attosecond pulse train light sources, complementary to FELs, combined with high resolution electron spectroscopy and electron-ion momentum coincidence spectroscopy [5,6] together with theoretical background [7]. I acknowledge all the collaborators in the authors’ list of [1-7] for fruitful collaborations.

[1] T. Driver et al. Nature 632, 762 (2024); J.-B. Ji et al. PRX 15, 041031 (2025).
[2] T. Barillot et al. PRX 11, 031048 (2021); https://arxiv.org/abs/2411.01700
[3] K. Prince et al. Nat. Photon, 10, 176 (2016); D. Iablonskyi et al. PRL119, 073203 (2017); D. You et al. New J. Phys. 21, 113036 (2019); M. Di Fraia et al. PRL 123, 213904 (2019); D. You et al. PRX 10, 031070 (2020).
[4] D. Hammerland et al. Sci. Adv. 10, eadl3810 (2024); M. Li et al. Sci. Adv. 11, 5415 (2025); M. Li et al. PRL 135, 183202 (2025).
[5] X.C. Gong et al. PRX 12, 011002 (2022); W. Jiang et al. Nat. Comm. 13, 5072 (2022); W. Jiang et al. Nature Comm. 16, 381 (2025).
[6] M. Han et al. Nat. Phys. 19, 230 (2023); Optica 10, 1044 (2023); Nature Photonics 18, 311 (2024); Sci. Adv. 10, eadj2629 (2024); Ultrafast Science 5, 0091 (2025).
[7] J. Ji et al. New. J. Phys. 26, 093014 (2024); J. Ji et al. J. Phys. B: At. Mol. Opt. Phys. 57, 235601 (2024); V. V. Serov et al. Phys. Rev. Lett. 136, 083202 (2026).

报告人简介：
Prof. Kiyoshi Ueda is a Professor Emeritus at Tohoku University, Japan, he received his Ph.D. from Kyoto University in 1982. After a distinguished career at Tohoku University as Research Associate, Associate Professor, and Full Professor (2003–2020), he now holds guest scientist positions at MBI Berlin and ShanghaiTech University. His research focuses on the ultrafast electronic and structural dynamics of small quantum systems—atoms, molecules, and clusters—using advanced light sources, including synchrotron radiation, femtosecond/attosecond lasers, and X-ray free-electron lasers (XFELs). Prof. Ueda is the author or coauthor of over 660 publications, including papers in Nature, Nature Photonics, Physical Review Letters, and Physical Review X. He has delivered approximately 170 invited and plenary lectures at international conferences. His editorial roles include serving on the Editorial Board of Physical Review X, and he has chaired major international conferences such as ICPEAC 2019. He is also a recipient of the Outstanding Referee Award from the American Physical Society.

邀 请 人：张鹏举 副研究员

联 系 人：王慧颖 why@iphy.ac.cn