Hannover 2013 – scientific programme
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MO: Fachverband Molekülphysik
MO 27: Poster 3: Collisions, Electronic Spectroscopy, Energy Transfer, Quantum Chemistry, Molecular Dynamics, Photochemistry, Spectroscopy in He-Droplets
MO 27.21: Poster
Thursday, March 21, 2013, 16:00–18:30, Empore Lichthof
Coulomb-explosion of metastable Allene dications induced by ultra-short laser pulses — •Philipp Cörlin1, Arne Senftleben1, Alexander Sperl1, Michael Schönwald1, Andreas Fischer1, Robert Moshammer1, and Joachim Ullrich2 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig
Two-body Coulomb-explosion of Allene (C3H4) induced by ultra-short, intense IR laser pulses has been studied using a Reaction Microscope that allows the coincident detection of all charged fragments over the full solid angle. Photo-ion–photo-ion coincidence spectra reveal fragmentation into H+ + C3H3+ as a significant channel which can be attributed to the decay of metastable Allene dications with life-times much longer than the laser pulse length. The life-time of these dications after excitation with 15 fs pulses (3·1013 W / cm2) at 800 nm is found to be best described by a sum of two exponential decays with half-lives of 100±10 ns and 700±50 ns respectively. These results will be discussed in the context of previous experiments[1] and calculations[2].
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