Mechanisms of one-photon two-site double ionization after resonant inner-valence excitation in Ne clusters
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In: Physical Review Research Volume 5 / Issue 1 (2023-01-30) , S. ; eissn:2643-1564
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The role of interatomic and intermolecular energy and charge-transfer processes in weakly bound matter is currently lively debated due to emerging destructive low-energy electrons and radicals. Here, we discuss two mechanisms of single-photon two-site double ionization occurring competitively or subsequently to resonant interatomic Coulombic decay (rICD) in inner-valence (2s→np) excited Ne dimers and clusters. The first mechanism is photoelectron-impact ionization which is, in general, not related to resonant excitation, but in the present case strongly enhanced and, thus, observable due to resonant excitation. Studying this mechanism at its energetic threshold enables addressing a subset of Ne dimers with selected bond lengths. The second mechanism is collisional ionization of energetic Rydberg atoms, which are produced by rICD in Ne clusters and may be ionized by collisions with neutrals on their way through the medium. Both mechanisms are identified by the coincident detection of charged products and, for the case of collisional ionization, confirmed by calculations. These mechanisms produce one more low-energy electron and ion than conventional rICD and, thus, should be considered in the discussion of the biochemical impact of photoinduced rICD processes.
@article{doi:10.17170/kobra-202302177503, author ={Hans, Andreas and Trinter, Florian and Schmidt, Philipp and Eckart, Sebastian and Grundmann, Sven and Hartmann, Gregor and Holzapfel, Xaver and Honisch, Carolin and Kastirke, Gregor and Kircher, Max and Melzer, Niklas and Ozga, Christian and Richter, Clemens and Rist, Jonas and Schöffler, Markus and Trabert, Daniel and Vela-Perez, Isabel and Viehmann, Johannes Heinrich and Weller, Miriam and Dörner, Reinhard and Hergenhahn, Uwe and Ehresmann, Arno and Knie, André and Gokhberg, Kirill and Ghosh, Aryya and Jahnke, Till}, title ={Mechanisms of one-photon two-site double ionization after resonant inner-valence excitation in Ne clusters}, keywords ={530 and Atomcluster and Autoionisation and Coulomb-Wechselwirkung}, copyright ={http://creativecommons.org/licenses/by/4.0/}, language ={en}, journal ={Physical Review Research}, year ={2023-01-30} }