Artist's conception of nucleosynthesis in a supernova.
Bild: Jenny Feige, University of Vienna
When Every Atom Counts - Analysing Nature with Utmost Sensitivity
Välkommen till ett kollokvium med Robin Golser från University of Vienna.
Isotope Mass Spectrometry with ion energies in the MeV range, so called Accelerator Mass Spectrometry (AMS), has two unique advantages: each individual ion can be identified by its mass and its nuclear charge and molecular interferences can be completely eliminated. This allows for abundance sensitivities as low as 1e-16 in the presence of an enormous background. Measuring at such low levels makes most sense for unstable isotopes since their presence can only be due to ongoing natural or anthropogenic production. Natural processes can thus be dated or traced or intrinsically labelled all across the periodic table from Be up to Pu. I will present the method and some examples mostly from atomic physics, such as the unambiguous identification of small doubly negatively charged molecules, and from nuclear physics, e.g. freshly produced material from supernovae detected on earth.
Kaffe och smörgåsar serveras utanför PJ-salen från klockan 14.45.
PJ, lecture hall, Fysikgården 2B, Fysik Origo