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Water is a radiation protection agent for ionised pyrrole

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arxiv 2010.00453 v3 pith:U53LGU6W submitted 2020-10-01 physics.chem-ph

Melby Johny , Constant A. Schouder , Ahmed Al-Refaie , Lanhai He , Joss Wiese , Henrik Stapelfeldt , Sebastian Trippel , Jochen Küpper This is my paper · ORCID
classification physics.chem-ph
keywords pyrrolewaterdamageionisedprotectionradiationagentmolecule
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abstract

Radiation-induced damage of biological matter is an ubiquitous problem in nature. The influence of the hydration environment is widely discussed, but its exact role remains elusive. Utilising well defined solvated-molecule aggregates, we experimentally observed a hydrogen-bonded water molecule acting as a radiation protection agent for ionised pyrrole, a prototypical aromatic biomolecule. Pure samples of pyrrole and pyrrole(H$_2$O) were outer-valence ionised and the subsequent damage and relaxation processes were studied. Bare pyrrole ions fragmented through the breaking of C-C or N-C covalent bonds. However, for pyrrole(H$_2$O)$^+$, we observed a strong protection of the pyrrole ring through the dissociative release of neutral water or by transferring an electron or proton across the hydrogen bond. Overall, a single water molecule strongly reduces the fragmentation probability and thus the persistent radiation damage of singly-ionised pyrrole.

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  1. Rotational-state-controlled dissociative ionization dynamics in $\mathrm{CF_2I_2}$

    physics.chem-ph 2026-08 conditional novelty 6.0 of 10

    The initial rotational state of CF2I2 molecules, selected by electrostatic deflection, strongly changes the branching of strong-field dissociative ionization products.

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