Hannover 2003 – scientific programme
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MO: Molekülphysik
MO 6: Poster I
MO 6.2: Poster
Tuesday, March 25, 2003, 16:00–18:30, Lichthof
Momentum vector correlation in 3-body decay of H3 — •Ulrich Galster, Patrick Kaminski, Ulrich Müller, Hanspeter Helm, Alexei Meremianin, Michael Walter, and John Briggs — Physikalisches Institut, Albert-Ludwigs Universität, Freiburg, Germany
Kinematically complete investigations of
triatomic hydrogen dissociating into three ground state hydrogen
atoms reveal highly structured maps of correlation between the
momentum vectors of the three atoms. Well-defined Rydberg states
of H3 are prepared via laser-excitation. Non-adiabatic
couplings between the Born-Oppenheimer potential energy surfaces
initiate three-body dissociation. The fragment momentum vector
correlation maps [1] provide a direct view of these couplings,
albeit hidden in an inverse problem of relating phase-space
density in the correlation map to phase-space density in the
molecular state. They are also applicable to predict a reliable
cross section for dissociative recombination [2]. We discuss the
experimental observations and outline general rules for the
analysis of the correlation maps. Research supported by the DFG
(SFB 276 TP C13).
[1] U. Müller,
Th. Eckert, M. Braun and H. Helm, Phys. Rev. Lett. 83, 2718
(1999).
[2] V. Kokoouline, C. H. Greene, and B. D. Esry, Nature 412, 891 (2001).