Ultrafast light-induced dynamics in the microsolvated biomolecular indole chromophore with water

Jolijn Onvlee, Sebastian Trippel and Jochen Küpper ()
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Jolijn Onvlee: Deutsches Elektronen-Synchrotron DESY
Sebastian Trippel: Deutsches Elektronen-Synchrotron DESY
Jochen Küpper: Deutsches Elektronen-Synchrotron DESY

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Interactions between proteins and their solvent environment can be studied in a bottom-up approach using hydrogen-bonded chromophore-solvent clusters. The ultrafast dynamics following UV-light-induced electronic excitation of the chromophores, potential radiation damage, and their dependence on solvation are important open questions. The microsolvation effect is challenging to study due to the inherent mix of the produced gas-phase aggregates. We use the electrostatic deflector to spatially separate different molecular species in combination with pump-probe velocity-map-imaging experiments. We demonstrate that this powerful experimental approach reveals intimate details of the UV-induced dynamics in the near-UV-absorbing prototypical biomolecular indole-water system. We determine the time-dependent appearance of the different reaction products and disentangle the occurring ultrafast processes. This approach ensures that the reactants are well-known and that detailed characteristics of the specific reaction products are accessible – paving the way for the complete chemical-reactivity experiment.

Date: 2022
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DOI: 10.1038/s41467-022-33901-w

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