Från strålning till radikaler: Röntgeninducerad dynamik i fria och solvatiserade system med tunga atomer

Tidsperiod: 2018-01-01 till 2021-12-31

Projektledare: Olle Björneholm

Medarbetare: Maria Novella Piancastelli, Maria-Novella Piancastelli, Piancastelli Maria-Novella

Finansiär: Vetenskapsrådet

Bidragstyp: Projektbidrag

Budget: 3 300 000 SEK

Understanding x-ray radiation damage is a crucial issue for medical applications of x-rays, as well as for x-ray free-electron-laser science aimed at molecular imaging. Biomaterials mostly consist of low-Z atoms, but high-Z atoms contribute more to radiation damage than their concentration suggests, due their higher ionization cross section. The first steps in radiation damage involve x-rays ionizing deep core levels, which will rapidly decay. The main aim of the proposed project is to explore the x-ray-induced electronic and nuclear dynamics in simple systems containing heavy atoms, both in gas phase and in solution. Synchrotron radiation will be used to photoexcite and photoionize such systems in the photon energy range 2-13 keV. The goals are to reach a very detailed picture of what happens when a molecule is irradiated by a x-ray photon (chemical bond breaking, change of geometry, photodissociation, charge transfer, etc.), with consequences in many fields such as chemistry of the upper atmosphere, environmental problems, detailed description of photochemical reactions, etc.; to study in great detail the effect of water solvation by comparing similar processes for the same heavy atoms in isolated species or in solution; to obtain a deep insight into the electronic and nuclear dynamics from deep core-hole creation in solvated species over intermolecular decay cascades to formation of radicals; to study first steps of radiation damage in simple biomolecular model systems.