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atomic:index [2018-10-06 16:39]
Friedrich Aumayr
atomic:index [2019-05-28 10:58] (current)
Friedrich Aumayr
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===== The True Power of the Solar Wind ===== ===== 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]].+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.at/en/research/news/news/the-true-power-of-the-solar-wind/|Read more]] or watch the TV report in the 3SAT magazine [[http://www.3sat.de/mediathek/?mode=play&obj=76582|nano]].
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===== The solution to an old riddle ===== ===== 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]].+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". [[https://www.tuwien.at/en/research/news/news/hollow-atoms-the-consequences-of-an-underestimated-effect/|Read more]].
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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. 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]].+ [[https://www.tuwien.at/en/research/news/news/graphene-able-to-transport-huge-currents-on-the-nano-scale/|Read more]].
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are formed when ions are fired at crystals at oblique angles of are formed when ions are fired at crystals at oblique angles of
incidence and could shed light on the underlying formation mechanism.  incidence and could shed light on the underlying formation mechanism. 
-[[http://www.tuwien.ac.at/en/news/news_detail/article/124257/|Read more]].+[[https://www.tuwien.at/en/research/news/news/meteorite-impact-on-a-nano-scale/|Read more]].
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collaboration with the Helmholtzzentrum Dresden-Rossendorf.  The results 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]].  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]].+[[https://phys.org/news/2014-04-energy-ions-membranes.html|Read more]].
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-====== Deep Impact - Highly charged ion research at TU Wien ======+{{:atomic:kathi.jpg?200 |Plasma wall interaction processes studied using a quartz crystal microbalance}} 
 + ===== High precision experiments for fusion research ===== 
 + 
 +A clean, eco-friendly and virtually inexhaustible source of energy: using nuclear fusion to produce electricity has been the dream of countless scientists for many years. However, until recently it has not been possible to construct a fusion reactor robust enough to withstand the enormous heat flux in the fusion plasma. To investigate this problem, a unique measuring device has been developed at the Institute of Applied Physics at TU Wien: One of the world’s most accurate scales.  
 +[[https://www.tuwien.at/en/research/news/news/high-precision-experiments-to-determine-the-future-of-the-worlds-energy/|Read more]]. 
 + 
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 + 
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 + 
 +====== Space Weathering on Mercury (3SAT magazine nano reports on our work) ====== 
 + 
 + 
 +<html><iframe width="494" height="300" src="https://www.youtube.com/embed/joNx0YyfOpI" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe></html> 
 + 
 + 
 +====== Deep Impact - Highly charged ion research at TU Wien (an imagefilm designed and produced by our graduate students) ====== 
 + 
 +<html><object width="494" height="300"><param name="movie" value="http://www.youtube.com/v/55oQALwLQ0I&hl=de_DE&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/55oQALwLQ0I&hl=de_DE&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="494" height="300"></embed></object></html>
-<html><object width="560" height="340"><param name="movie" value="http://www.youtube.com/v/55oQALwLQ0I&hl=de_DE&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/55oQALwLQ0I&hl=de_DE&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="494" height="300"></embed></object></html> 
====== Research Statement ====== ====== Research Statement ======
atomic/index.1538836760.txt.gz · Last modified: 2018-10-06 16:39 by Friedrich Aumayr