Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 4: Photoionization I (exchanged with A1)
A 4.4: Vortrag
Montag, 8. März 2010, 17:30–17:45, F 303
Dissociation of protonated water clusters after x-ray ionization — •Christian Domesle1, Lutz Lammich2, Henrik B. Pedersen2, Brandon Jordon-Thaden1, Marko Förstel3, Tiberiu Arion3, Toralf Lischke3, Uwe Hergenhahn3, Stefan Klumpp4, Michael Martins4, Oded Heber5, and Andreas Wolf1 — 1Max-Planck Institut für Kernphysik, Heidelberg, Germany — 2University of Aarhus, Denmark — 3Max-Planck Institut fuer Plasmaphysik, Garching, Germany — 4Universität Hamburg, Germany — 5Weizmann Institute of Science, Rehovot, Israel
Protonated water clusters are important systems in interstellar and planetary atmospheric environments. Moreover, studies of their properties in the gas phase elucidate the elementary mechanisms behind the mobility of free charges in aqueous surroundings. Soft x-rays give access to the excited electronic orbitals of these systems and their role in the fragmentation dynamics. With the FEL light source (FLASH) at DESY and the ion beam infrastructure TIFF, the observation and imaging of individual fragmentations triggered by soft x-ray absorption on dilute gas-phase targets of these ionic species has become possible. We investigated the photoionization and subsequent fragmentation of H+(H2O)2. At TIFF the serial arrangement of two MCP detectors with delay-line readout allowed for time, position and coincidence investigations of the fragments. By means of time of flight analysis the fragments could be clearly indentified. Coincident events on both detectors give first information on the expected final decay channels.