The 16th Femtochemistry Conference (FEMTO16)

Session

Session 9 - Solvation and reaction dynamics II

9

Jun 25, 2025, 9:00 AM

Savoia Hotel, Trieste, Italy

273. Stefan Haacke (Chair)

6/25/25, 9:00 AM

17. Ultrafast Wolff rearrangement and solvent reactions of UV-photoexcited diazocarbonyl compounds

Andrew Orr-Ewing (University of Bristol)

6/25/25, 9:10 AM

Invited talk

Following UV photoexcitation, organic diazo compounds can eliminate N$_{2}$ by C=N bond dissociation to form highly reactive singlet carbene intermediates. In solution, these carbenes rapidly react with nucleophilic solvents such as alcohols or ethers to form zwitterionic ylides. If the starting molecules are $\alpha$-diazocarbonyl compounds (with a carbonyl group adjacent to the diazo...

135. Elucidating the Interplay between Ultrafast Internal Conversion, Intersystem Crossing, and Proton Transfer for Guiding New Photochemical Reactivities

Alexander Tarnovsky (Department of Chemistry and the Center for Photochemical Sciences, Bowling Green State University, USA)

6/25/25, 9:40 AM

Contributed talk

The mechanism of newly discovered photochemical reactions of $\beta$-enaminones and maleimide derivatives is a topic of interest and ongoing discussion [1,2]. We have examined excited-state dynamics in these systems following femtosecond UV excitation by means of ultrafast transient absorption spectroscopy with dispersed, broadband probing, complemented by the tools of computational...

137. Electronic structure and excited state reactions of molecules in aqueous solutions studied by time-resolved XUV photoelectron spectroscopy

Oleg Kornilov (Max Born Institute)

6/25/25, 10:00 AM

Contributed talk

We report on the state-of-the-art time-resolved photoelectron spectroscopy (LJ-TRPES) of molecular chromophores solvated in aqueous environment using wavelength-selected XUV pulses from high-order harmonic generation and micro-liquid jet (LJ) technology. LJ-TRPES is one of the most direct analytic methods to follow transient electronic structures of complex photoexcited molecules.

In one...

232. Pseudo-rotation versus rotational diffusion in the ligand exchange 2D-IR spectra of iron pentacarbonyl

Dr Jan Helbing (University of Zurich)

6/25/25, 10:20 AM

Contributed talk

We re-visit the ligand exchange dynamics in Fe(CO)$_5$ , a textbook example of fluxionality or Berry pseudo rotation, by high-resolution polarization-dependent 2D-IR spectroscopy. Coupling maps at short waiting times reveal detailed information about the anharmonic structure: a very small negative coupling between the IR-active CO stretch modes A2′′ and E′ and distinct diagonal and...