X-ray phenomena at the high intensity frontier
Understanding ultraintense X-ray interactions with matter is a new frontier with the advent of X-ray free electron lasers (XFELs), which provide femtosecond X-ray pulses of peak brightness a billion-fold greater than those available from synchrotrons. We explore this frontier with a concerted experimental and theoretical approach, investigating new nonlinear X-ray phenomena and imaging modalities. We use forefront tools, namely worldwide X-ray free electron lasers and high performance computers.
Ultrafast X-ray induced phenomena
Understanding X-ray initiated processes in complex environments is a grand challenge problem with broad implications for radiation chemistry, physics and biology. High-brightness tunable ultrafast X-ray pulses, as will be available with next generation X-ray free electron lasers, will be able to track both inner- and outer-shell electronic motion on their natural timescales with chemical site specificity. We tackle this challenge with a combination of static and time-resolved pump-probe X-ray methods with a focus on prompt probes (photoelectron spectroscopy and transient absorption) to isolate motion prior to inner-shell decay.
X-ray probes of condensed phase photoinduced processes
We focus on understanding the fundamentals of laser-induced phenomena in solution, from the first steps following photoabsorption, with changes in the electronic configuration occurring on the femtosecond time scale, to subsequent processes involved in the evolution of the excited states on the picosecond to microsecond timescales. X-ray spectroscopic probes are used both at synchrotrons and XFELs to track these electronic and structural changes. We are especially interested in understanding the influence of the solvent on the reactivity and on influencing the outcome of photoreactions using shaped laser pulses and X-ray feedback.
- Our PRL paper “RIXS Reveals Hidden Local Transitions of the Aqueous OH Radical” attracts press (SLAC)
- Linda co-organizes ACS National Meeting Symposium “Molecular Excitation Induced Dynamics in Chemical & Biological Systems: A symposium celebrating the achievements of C. Bradley Moore” Aug 2020
- Anne Marie receives Impact Argonne Award for efforts to provide support and information for Argonne caregivers during COVID19 pandemic, Jul 2020
- Linda profiled by UChicago Physical Science Division, Jul 2020
- IDREAM 2.0 EFRC funded with new AMO group participation exploiting our deep knowledge of radiation interaction with matter for nuclear waste remediation
- Anne Marie speaks at 2020 X-ray Neutron Summer School, Jul 2020
- Adam Fouda spokesperson for winning Ultrafast X-ray Summer School proposal, Jun 2020
- Anne Marie speaks at Global XAS Journal Club, Jun 2020
- Adam Fouda joins group, April 2020
- Our Nature Communications paper “The role of transient resonances for ultra-fast imaging of single sucrose nanoclusters” attracts popular press (Argonne, Nanotechnology World, Optics Photonics)
- Our Science paper on “Observation of the fastest chemical processes in the radiolysis of water” attracts popular press (Chemistry World, Optics Photonics), January 2020
- Linda co-chairs Conference Undergraduate Women in Physics at University of Chicago, January 2020
- Dimitris Koulentianos joins group, September 2019
- Christopher J. Otolski joins group, July 2019
- Anne Marie speaks at DOE National Science Bowl, April 2019
- Linda gives plenary at LCLS 10th Anniversary Celebration, April 2019