Stuttgart 2012 – wissenschaftliches Programm

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SYIB: Symposium Fast Ion Beams in Nuclear, Atomic and Molecular Physics Research

SYIB 2: Fast Ion Beams in Nuclear, Atomic and Molecular Physics Research II

SYIB 2.3: Hauptvortrag

Dienstag, 13. März 2012, 15:00–15:30, V55.22

Fast beam momentum spectroscopy on XUV excited molecular ions — •Henrik Pedersen — Department of Physics and Astronomy, Aarhus University, Denmark

Dynamics of highly excited molecular ions reached by XUV-photoabsorption has been a main field of research at the Free-electron LASer in Hamburg FLASH. XUV photoinduced processes in molecular ions are relevant both for understanding molecular dynamics in simple model systems, for characterizing processes in ionized gas-phase media, e.g. in astrophysical plasmas and outer planetary atmospheres, as well as for describing ionic states in liquid media. In the presentation, we will exemplify the new possibilities for studies of molecular ions using FELs by recent results from the TIFF (Trapped Ion Fragmentation with an FEL) experiment at FLASH. For the simplest water cluster cations, H⁺(H₂O)_n=1−4, the dominating photoionization and -dissociation channels have been clarified among numerous possibilities and revealed interesting trends in the product branching ratios for dissociative photoionization with cluster size. Finally, we will give some perspectives for further developments when FELs and synchrotron radiation facilities are combined with methods based on accelerated, stored, and cooled ion beams.