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atomic:index [2018-06-09 18:13]
Friedrich Aumayr
atomic:index [2018-10-20 08:56] (current)
Friedrich Aumayr
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 +====== Research Highlights ======
 +
 +{{:atomic:sonnenwind_nasa_sonne_merkur.jpg?200 |copyright NASA}}
 + ===== The True Power of the Solar Wind =====
 +
 +The solar wind, a steady stream of mainly protons and few multiply charged heavier ions from the sun, causes significant erosion upon impact on the surface of atmosphere-less planets like Mercury or on the moon. In a recent paper in [[https://doi.org/10.1016/j.icarus.2018.05.028|Icarus ]] we now show that previous models of this process are incomplete. The effects of solar wind bombardment are in some cases much more drastic than previously thought. The role of solar wind constituents heavier than protons and in particular the role of the particles charge state has so far been underestimated. [[https://www.tuwien.ac.at/en/news/news_detail/article/125997/|Read more]] or watch the TV report in the 3SAT magazine [[http://www.3sat.de/mediathek/?mode=play&obj=76582|nano]].
 +
 +<clear>
 +\\
 +
 +
 +{{:atomic:icd_blue.jpg?200 |ICD}}
 + ===== The solution to an old riddle =====
 +
 +For more than 20 years atomic physicists have speculated about the mechanism, which allows "hollow atoms" to deexcited with a few femtoseconds. Our experiments with highly charged ions and graphene now show that the reason is an effect so far not accounted for: the so-called “interatomic coulomb decay”. Our results have been published in the journal [[http://dx.doi.org/10.1103/PhysRevLett.119.103401|Physical Review Letters]] and have been highlighted there as "editors' suggestion". [[http://www.tuwien.ac.at/en/news/news_detail/article/125232/|Read more]].
 +
 +<clear>
 +\\
 +<clear>
 +
 +{{:atomic:csm_graphen_eyecatcher_51a9f9b6ef.jpg?200 |HCI impact on Graphene}}
 + ===== Graphene able to transport huge currents on the nano scale =====
 +
 +In this work, published by [[http://dx.doi.org/10.1038/ncomms13948|Nature Communications]], we demonstrate that graphene, a two-dimensional form of carbon, is able to provide tens of electrons for charge neutralization of a slow highly charged ion within a few femtoseconds only. This in turn results in extremely high current densities, which the graphene can withstand without suffering permanent damage.
 + [[https://www.tuwien.ac.at/en/news/news_detail/article/124630/|Read more]].
 +
 +<clear>
 +\\
 +<clear>
 +
 +
 +{{:atomic:csm_iontrack01_e7ea256e4e2.jpg?200 |AFM image}}
 +
 + ===== Meteorite Impact on a Nano Scale =====
 +
 +A meteorite impacting the earth under a grazing angle of incidence can
 +do a lot of damage; it may travel a long way, carving a trench into the
 +ground until it finally penetrates the surface. The impact site may be
 +vaporized, there can be large areas of molten ground. All that remains
 +is a crater, some debris, and an extensive trail of devastation on both
 +sides of the impact site.
 +Hitting a surface with high-energy, heavy ions has quite similar effects
 +– only on a much smaller scale. In [[http://dx.doi.org/10.1088/0953-8984/28/40/405001|Journal of Physics: Condensed Matter]] we investigated the microscopic structures which
 +are formed when ions are fired at crystals at oblique angles of
 +incidence and could shed light on the underlying formation mechanism. 
 +[[http://www.tuwien.ac.at/en/news/news_detail/article/124257/|Read more]].
 +
 +<clear>
 +<clear>
 +
 +
 +{{:atomic:csm_karbonfolie_71db2835ec.jpg?200 |HCI-surface interaction}}
 + ===== Highly Charged Ions Sent through Nano-Membranes =====
 +
 +A bullet fired through a block of wood will slow down. In a similar way,
 +ions are decelerated when they pass through a solid material: the
 +thicker the material, the larger the energy loss will be. However, this
 +picture breaks down in ultra-thin target materials, which only consist
 +of a few layers of atoms. This was demonstrated by our group in
 +collaboration with the Helmholtzzentrum Dresden-Rossendorf.  The results
 +are reported in [[http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.153201|Physical Review Letters]] and [[http://dx.doi.org/10.1088/2053-1583/2/3/035009|2D Materials]]. 
 +[[https://www.tuwien.ac.at/de/aktuelles/news_detail/article/8747/|Read more]].
 +
 +<clear>
 +
 +<clear>
 +
 +====== Deep Impact - Highly charged ion research at TU Wien ======
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 +====== Research Statement ======
 +
 +{{:atomic:apskl.jpg?200 |Atomic and Plasma Physics}}
 + ===== Research activities =====
-Research activities in the "Atomic and Plasma Physics" group are focused on the interaction of (multi-charged) ion beams and (femtosecond) laser radiation with matter (atoms, molecules, surfaces) both from a fundamental point of view and because of their relevance for plasma-wall interaction, fusion plasma diagnostics, material processing and medical applications.+Research activities in the "Atomic and Plasma Physics" group are focused on the interaction of (multi-charged) ion beams with matter (atoms, molecules, surfaces) both from a fundamental point of view and because of their relevance for plasma-wall interaction, fusion plasma diagnostics and material manipulations. 
 +<clear> 
 +\\ 
 +<clear>
-A major part of the research program is being carried out within Austrian fusion research program [[http://www.oeaw.ac.at/fusion/|Fusion@ÖAW]] funded by the Horizon 2020 project [[https://www.euro-fusion.org/|EUROfusion]]. Our research is further funded by Austrian Fonds zur Förderung der wissenschaftlichen Forschung [[http://www.fwf.ac.at/|FWF]], Austrian Academy of Sciences [[http://www.oeaw.ac.at/|ÖAW]] and [[http://www.f-schiedel-stiftung.at/|Friedrich Schiedel-Stiftung]] für Energietechnik. The group participated in the EU networks [[http://www.its-leif.org/|ITS LEIF]] (HPRI-CT-2005-026015) and was one of the member groups in the EU networks LEIF (HPRI-CT-1999-40012) and [[http://www.chm.bris.ac.uk/pt/harvey/mcinet/welcome.htm|MCInet]] (HPRN-CT-2000-00027).+====== Funding ======
 +A major part of the research program is being carried out within Austrian fusion research program [[http://www.oeaw.ac.at/fusion/|Fusion@ÖAW]] funded by the Horizon 2020 project [[https://www.euro-fusion.org/|EUROfusion]]. Our research is further funded by Austrian Fonds zur Förderung der wissenschaftlichen Forschung [[http://www.fwf.ac.at/|FWF]], Austrian Academy of Sciences [[http://www.oeaw.ac.at/|ÖAW]] and [[http://www.f-schiedel-stiftung.at/|Friedrich Schiedel-Stiftung]] für Energietechnik. The group participated in the EU networks ITS LEIF (HPRI-CT-2005-026015) and was one of the member groups in the EU networks LEIF (HPRI-CT-1999-40012) and MCInet (HPRN-CT-2000-00027).
 +<clear>
===== International collaborations ===== ===== International collaborations =====
atomic/index.1528560815.txt.gz · Last modified: 2018-06-09 18:13 by Friedrich Aumayr