Ionization and radiative decays in atomic and molecular systems

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Several topics in theoretical and computational physics will be pursued:1) Multiple ionization of simple molecules by ion impact, and by superintense laser irradiation. The ionization of water molecules by ion or laser bombardment plays an important role in radiation medicine. Our previous work on ionization of atoms will be extended to this more complicated case. It will lead to more accurate theoretical results which will be compared with experiments on molecule fragmentation.2) Radiative decays of anti-hydrogen in magnetic and electric fields using semiclassical methods.  This mostly numerical study will help to understand the capture of anti-hydrogen in a magnetic trap, which will be implemented at CERN (Geneva, Switzerland) in the near future by the ATRAP collaboration. These experiments are conducted to explore the symmetry in nature between matter and anti-matter. The calculations will help experimentalists to form anti-hydrogen in such levels that losses will be minimized.3) Ionization and electron-positron pair production in relativistic heavy-ion collisions. We have developed anew computational method for the Dirac equation in extreme relativistic situations. The work is related to the breakdown of the normal vacuum state: in uranium-uranium collisions at the Coulomb barrier electron-positron pairs are created. With the current upgrade of the GSI accelerator and storage ring (Darmstadt, Germany) new measurements of such collisions will be undertaken. Our calculations will serve to explain these data.