X-ray & neutron spectroscopy, scattering, and imaging in atmospheric chemistry

Session

Ultrafast or time-resolved

Nov 14, 2024, 1:50 PM

OSGA/EG6 (Paul Scherrer Institut)

Conveners

Ultrafast or time-resolved

• Markus Ammann (PSI - Paul Scherrer Institut)

Ultrafast or time-resolved

• Luca Artiglia (Paul Scherrer Institut)

10. Opportunities from Ultrafast Single-Particler Single-Shot Imaging Experiments for Atmospheric Sciences

Christoph Bostedt (PSI - Paul Scherrer Institut)

11/14/24, 1:50 PM

The intense X-ray pulses from free-electron laser sources (XFEL) allow imaging of single nanometer sized samples with single shots. In my talk I will briefly introduce XFELs and the single-shot imaging capabilities of free-flying particles at SwissFEL. I will then present a few showcase examples for studying the (static) morphology of nanoparticles and following light-induced processes on the...

6. Frontiers of time-resolved single-particle coherent diffractive imaging

Alessandro Colombo (ETHZ)

11/14/24, 2:10 PM

"Intense X-ray free-electron laser pulses allow to obtain ""snapshots"" of individual nanoparticles in free flight. The accessible size regime roughly ranges from tens of nanometers up to a few micrometers with a spatial resolution of few nanometers and a temporal resolution of 50 femtoseconds or better. Thus, the approach called single-shot single-particle Coherent Diffractive Imaging (CDI)...

7. Unraveling the chemistry by capturing elusive and reactive intermediates

Patrick Hemberger (PSI - Paul Scherrer Institut)

11/15/24, 11:00 AM

Be it in heterogeneous catalysis, combustion, the atmosphere or in the interstellar medium, reactive and elusive intermediates are the key players responsible for the branching of chemical reaction pathways. This makes radicals, carbenes or ketenes in control of the selectivity of industrial processes. However, catching elusive intermediates is challenging but essential for unveiling the...

8. Site-selective chemical dynamics with femtosecond precision

Andre Al Haddad (PSI - Paul Scherrer Institut)

11/15/24, 11:20 AM

In this presentation, I will discuss advanced experimental techniques available at the Swiss Free Electron Laser (SwissFEL) for probing time-resolved chemical dynamics with femtosecond temporal resolution. My talk will focus on two key areas. First, I will explore time-resolved X-ray photoemission spectroscopy on gaseous targets, potentially extending the method to aerosol systems. Second, I...

9. Two-color X-ray pump-probe experiments at SwissFEL

Kirsten Schnorr (PSI)

11/15/24, 11:40 AM

Multi-color X-ray pulses with adjustable delay allow to follow ultrafast charge and energy transfer in time and space due to the state selectivity of X-ray photoabsorption. With two freely tunable X-ray pump-probe energies from the Athos line, we can excite at one atomic site and monitor subsequent relaxation processes throughout a system at another site. In this talk, I will show results from...