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Jonathan Lang (Argonne National Laboratory)5/6/26, 8:30 AM
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Ian Robinson (Brookhaven National Laboratory)5/6/26, 8:40 AM
We performed ultrafast time-resolved diffraction experiments at the x-ray free-electron laser (XFEL) facility in
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Pohang, Korea to study 300 nm polycrystalline thin films of gold evaporated onto silicon nitride windows,
melted by a Ti-sapphire laser pulse [1]. A clear splitting of the (111) powder ring was found at certain fluences
after a time delay of 20-100 ps. From the evolution of the... -
Peijun Guo (Yale)5/6/26, 9:05 AM
Developing light-emitting semiconductors with high photoluminescence quantum yield (PLQY) is important for
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energy-efficient solid-state lighting applications. A subset of solution-processed metal halide perovskites has
been shown to exhibit intrinsic, broadband white-light emission with high PLQY from 10% to 90%. The
intrinsic white-light emission is attributed to self-trapped excitons... -
Alfred Zong (Stanford University)5/6/26, 9:30 AM
Photoexcitation by ultrashort laser pulses plays a crucial role in controlling reaction pathways, creating
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nonequilibrium material properties, and offering a microscopic view of complex dynamics at the molecular
level. The photo-response following a laser pulse is, in general, non-identical between multiple exposures due to
spatiotemporal fluctuations in a material or the stochastic nature... -
Anne Marie March (Argonne National Laboratory)5/6/26, 10:15 AM
We are using a multi-edge, time-resolved x-ray spectroscopy approach to investigate how the solvent
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environment controls reactivity in aqueous iron hexacyanide. This highly charged coordination complex
([Fe(CN)₆]⁴⁻) exhibits useful redox behavior ([Fe²⁺(CN)₆]⁴⁻ ⇌ [Fe³⁺(CN)₆]³⁻) alongside a minor ligand exchange
reaction in which CN⁻ is released and replaced by water. We ask whether... -
Mingda Li (Massachusetts Institute of Technology)5/6/26, 10:40 AM
Defects and structural disorder govern materials functionality, yet their quantitative, non-destructive
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characterization remains a major challenge. For defect configuration, we introduce DefectNet, a foundation
model that predicts the chemical identity and concentration of multiple coexisting substitutional point defects
directly from phonon density-of-states spectra. Trained on over 16,000... -
Xiaoyi Zhang5/6/26, 11:05 AM
This brief presentation will highlight the Time-Resolved Research Group’s new and enhanced capabilities
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developed to leverage the APS Upgrade, including pump-probe multimodal imaging and diffraction, grazing-
incidence scattering, pair distribution function measurements, and double-laser-pump TR-XAS. Delivered
immediately before the 40-minute discussion period in the morning session, it is... -
Philippe Piot5/6/26, 1:30 PM
Argonne National Laboratory is exploring next-generation x-ray free-electron laser (XFEL) concepts to enable
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capabilities beyond existing facilities while complementing the Advanced Photon Source (APS) storage ring. In
this early phase, the focus is on architectures that support multi-user operation and deliver versatile photon-
pulse characteristics, including flexible temporal structure,... -
Agostino Marinelli5/6/26, 1:50 PM
X-ray free-electron lasers (XFELs) are the brightest sources of x-rays available, with a peak brightness that
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surpasses table-top harmonic sources and synchrotron radiation facilities by many orders of magnitude.
A defining feature of XFELs is their inherent flexibility, which enables the control of the spectral, spatial, and
temporal properties of the radiation and tailoring of the pulse... -
Uwe Bergmann (University of Wisconsin, Madison)5/6/26, 2:15 PM
We present our progress in exploring the phenomenon of stimulated x-ray emission spectroscopy (S-XES)
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based on inner-shell lasing at 6 – 8 keV as a new spectroscopy tool, and as a new source of ultrafast hard x-ray
pulses. We first discuss the principle of S-XES, and the experimental methods required for generating and
measuring it. We then discuss recent results for spectroscopy... -
Thomas Wolf (SLAC National Laboratory & Stanford University)5/6/26, 3:20 PM
X-ray free electron lasers (XFELs), with their unique source properties—including femtosecond and sub-
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femtosecond pulse durations, high peak brightness, and coherence—offer compelling opportunities for chemical
research. These capabilities allow for the investigation of compounds undergoing photochemical reactions using
site- and element-specific spectroscopy, and, in parallel, for... -
Yue Cao (Argonne National Laboratory)5/6/26, 3:45 PM
In this talk, I will discuss scientific opportunities at the proposed compact XFEL. These opportunities center
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around the ultrafast dynamics in quantum materials. These dynamics include changes in the electron
wavefunction and density within atomic clusters or cages, as well as evolutions of charge and magnetic
domains. In both cases, x-ray resonance and polarization will play a central... -
Lois Pollack (Cornell University)5/6/26, 4:10 PM
X-rays from XFEL sources have had enormous impact on structural biology both through crystallography and
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solution scattering. The new methods demonstrated at XFELs focus on measuring the structural dynamics of
biological macromolecules; these motions enable life. The demonstration of serial femtosecond crystallography,
where tens of thousands of small crystals are individually sampled by...
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