期刊
COMMUNICATIONS PHYSICS
卷 4, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s42005-021-00686-1
关键词
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资金
- Austrian Science Fund (FWF) [Y 1174-N36, I 4914-N]
- TU Wien's competitive Innovative Projects programme
- Doctoral College TU-D
The article introduces a new method for studying the dynamic changes in ion charge states as they pass through graphene layers, along with a first-principles approach based on the virtual photon model to provide important insights into interparticle de-excitation processes. The authors reveal the electron capture mechanism for ions passing through graphene layers through a combination of experimental and theoretical analysis.
Over seventy years ago, Niels Bohr described how the charge state of an atomic ion moving through a solid changes dynamically as a result of electron capture and loss processes, eventually resulting in an equilibrium charge state. Although obvious, this process has so far eluded direct experimental observation. By peeling a solid, such as graphite, layer by layer, and studying the transmission of highly charged ions through single-, bi- and trilayer graphene, we can now observe dynamical changes in ion charge states with monolayer precision. In addition we present a first-principles approach based on the virtual photon model for interparticle energy transfer to corroborate our findings. Our model that uses a Gaussian shaped dynamic polarisability rather than a spatial delta function is a major step in providing a self-consistent description for interparticle de-excitation processes at the limit of small separations. Ion-solid interactions are governed by a range of complex processes the direct experimental observation of which pose their own set of challenges. Here, the authors present a joint experimental and first-principles approach to study and describe the underlying mechanism of electron capture for an ion travelling through layers of graphene with monolayer precision.
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