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MO: Molekülphysik
MO 9: Photoelektronenspektroskopie
MO 9.6: Talk
Monday, March 22, 2004, 17:45–18:00, HS 332
Maps of non-adiabatic coupling in triatomic hydrogen — •Ulrich Galster, Ulrich Müller, and Hanspeter Helm — Physikalisches Institut, Albert-Ludwigs Universität, Freiburg, Germany
In the recent years many efforts from the experimentalist as well as from the theorists side aimed to study effects which arise from the breakdown of the Born-Oppenheimer approximation. The most fundamental insight in the so-called non-adiabatic couplings can be obtained by investigating the simplest molecular systems like H2 or H3. We present an experiment that reveals detailed information of the non-adiabatic couplings initiating three-body breakup of triatomic hydrogen. A triple-coincidence technique allows to derive the momentum-vector correlation of the fragments H(1s)+H(1s)+H(1s) in the dissociation of state-selected H3-molecules. Maps of this correlation reveal highly structured patterns. A theoretical consideration of the dissociation process uncovers these patterns to be a fingerprint of the non-adiabatic operator that couples non-dissociative to dissociative potential-surfaces.