Dresden 2011 – scientific programme
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A: Fachverband Atomphysik
A 9: Interaction with VUV and X-ray light (FEL) II
A 9.5: Talk
Tuesday, March 15, 2011, 12:15–12:30, BAR 205
Momentum spectroscopy of ion photo-fragmentation products at XUV energies — •Christian Domesle1, Hernik B. Pedersen2, Lutz Lammich2, Brandon Jordan-Thaden1, Marko Förstel3, Tiberiu Arion3, Uwe Hergenhahn3, Natalia Guerassimova4, and Andreas Wolf1 — 1Max-Planck Institut für Kernphysik, Heidelberg, Germany — 2Department of Physics and Astronomy, University of Aarhus, Denmark — 3Max-Planck Institut für Plasmaphysik, Garching, Germany — 4HASYLAB at DESY, Hamburg, Germany
Fragmentation of protonated water and small water clusters H+(H2O)(n= 1,2,3) in the gas phase at XUV energies are of direct relevance in interstellar media and planetary atmospheres. With Free Electron Laser light sources, as FLASH at DESY in Hamburg, investigations of break up processes initiated by ionization of inner valence electrons have become possible. In the crossed beams ion beam infrastructure TIFF at FLASH, the photon and ion beam are temporally and spatially overlapped within a newly designed interaction region. This interaction region, also acting as a saddle point electron spectrometer, allows for trapping the ions and for position and time resolved electron detection. In combination with a serial arrangement of two fragment detectors, charged and neutral fragments can also be time and position analyzed. We report on measurements we performed on protonated water molecules and small clusters, for which fragmentation pathways and branching ratios of the various observed decay channels could be obtained.