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MO: Fachverband Molekülphysik
MO 8: Poster: Collisions
MO 8.2: Poster
Tuesday, March 12, 2024, 17:00–19:00, Tent C
Intermolecular Coulombic Decay from organic dimers — •Deepthy Maria Mootheril1, Xueguang Ren2, Thomas Pfeifer1, and Alexander Dorn1 — 1Max-Planck-Institute of Nuclear Physics, Heidelberg, 69115, Germany — 2School of Physics, Xi’an Jiaotong University, Xi’an, 710049, China
Inter-atomic/intermolecular Coulombic decay
(ICD) is an important electronic relaxation
mechanism after inner-valence ionization
of atoms or molecules with weakly bound neighbours.
Here we study ICD in organic heterocycle dimers like thiophene dimers and pyridine-water complexes induced by
electron collisions (109 eV) using the (e,e+2ion) coincidence technique [1]. Collisions with electrons causes ionization of the inner valence orbital. It is observed that the energy released after relaxation to the inner valence
vacancy is transferred to the neighbouring
molecule, mainly via ICD, ionizes the
outer valence orbital of the neighbor and thus inducing Coulomb explosion
of the dimer. Comparison of projectile energy loss spectra with theoretical
single ionization spectra shows the ICD mainly proceeds from the C 2s−1 inner valence vacancy in thiophene
dimers and from the O 2s−1 and the N 2s−1 inner-valence vacancies in pyridine-water clusters [2].
References:
[1] X. Ren et al 2018 Nature Physics 14(10) 1062-
1066
[2] A. D. Skitnevskaya et al 2023 J. Phys. Chem. Lett.
14(6) 1418-1426
Keywords: Electron collisions; biomolecules; ICD