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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260711T201802Z
UID:https://www.mpsd.mpg.de/events/46182/2736
DTSTART:20260710T090000Z
DTEND:20260710T100000Z
CLASS:PUBLIC
CREATED:20260706T091802Z
DESCRIPTION: Ultrafast electron diffraction (UED) enables direct observatio
 n of structural dynamics in photoexcited solids\, liquids\, and gases on f
 emtosecond timescales [1-6]. In this talk\, I will tell you about our rece
 nt efforts to push UED across complementary keV and MeV regimes. I will fo
 cus primarily on our new 90 keV instrument\, where radiofrequency (RF) com
 pression allows us to generate high-brightness electron pulses with unprec
 edented high throughput. By synchronizing the RF compression to the drive 
 laser with better than 6 fs (FWHM) precision [9]\, we achieve 50-114 fs (F
 WHM) electron pulses at 40-100 kHz [10\,11]. I will show you how shot-nois
 e limited UED is powerful in tracking ultrafast structural dynamics in sol
 ids\, using aluminium thin films as a model system\, where we resolve non-
 thermal lattice dynamics governed by short- or long-range interactions [12
 \,13]. In the final part of the talk\, I will briefly turn to complementar
 y 30 fs MeV UED experiments [7\,8] in molecules and liquids. I will highli
 ght how the combination of elastic and inelastic electron scattering gives
  access to the coupled electronic-nuclear dynamics [14] in the photochemis
 try of gas-phase aldehydes. I will also reveal the charge transfer and nuc
 lear dynamics in donor-acceptor molecules in highly polar liquid environme
 nts\, illustrating the powerful combination of keV and MeV UED to study ph
 otochemical reactions across all three states of matter with femtosecond t
 emporal and picometre spatial resolutions. [1] G. Mourou and S. Williamson
 \, <i> Appl. </i><i>Phys. Lett. </i>41\, 44-45 (1982). [2] J. C. Williamso
 n <i>et al.</i>\, <i>Nature </i>386\, 159-162 (1997). [3] X. Shen <i>et al
 .</i>\, <i>Struct. </i><i>Dyn. </i>6\, 054305 (2019). [4] T. Xiong <i>et a
 l.</i>\, <i>Phys. </i><i>Rev. Res. </i>2\, 043064 (2020). [5] D. Filippett
 o <i>et al.</i>\, <i> Rev. Mod. </i><i>Phys. </i>94\, 045004 (2022). [6] K
 . Amini\, A. Rouzée\, M. J. J. Vrakking (Eds.)\, “Structural Dynamics w
 ith X-ray and electron scattering”\, RSC books (2023). [7] F. Qi <i>et a
 l.</i>\, <i>Phys. Rev. Lett. </i>124\, 134803 (2020). [8] Y. Yang <i>et al
 .</i>\, arXiv:2508.03946 (2025). [9] M. R. Otto <i>et al.</i>\, <i>Struct.
  </i><i>Dyn. </i>4\, 051101 (2017). [10] K. Amini <i>et al.</i>\, arXiv:26
 01.02597 (2026). [11] A. Ryabov and K. Amini\, arXiv:2601.02333 (2026). [1
 2] F. Rodriguez Diaz <i>et al.</i>\, <i>Struct. </i><i>Dyn. </i>11\, 05430
 2 (2024). [13] F. Rodriguez Diaz and K. Amini\, arXiv:2601.02055 (2026).[1
 4] J. Yang <i>et al.</i>\, <i>Science </i>368\, 885 (2020).\nSpeaker:  Kas
 ra Amini
LAST-MODIFIED:20260706T092115Z
LOCATION:MPSD Bldg. 900\, Room: Seminar Room EG.136
ORGANIZER;CN=Andrea Cavalleri:mailto:
SUMMARY:QCMD Seminar: Ultrafast electron diffraction imaging of femtosecond
  structural dynamics in solids\, liquids\, and gases
URL;VALUE=URI:https://www.mpsd.mpg.de/events/46182/2736
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