Berlin 2014 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 10: Posters 2: Biomolecules, Energy Transfer, Clusters, Quantum Chemistry, Molecular Dynamics and Chirality
MO 10.22: Poster
Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais
The time-scale of nonlinear events driven by strong fields: Can one control the spin-coupling before ionization runs over? — •Mirjam Falge1, Patricia Vindel-Zandbergen2, Volker Engel1, Manfred Lein3, Bo Y. Chang4, and Ignacio R. Sola2 — 1Universität Würzburg, Institut für Physikalische und Theoretische Chemie, Campus Nord, Emil-Fischer-Str. 42, 97074 Würzburg, Germany — 2Departamento de Quimica Fisica, Universidad Complutense, 28040 Madrid, Spain — 3Leibniz Universität Hannover, Institut für Theoretische Physik, Appelstraße 2, 30167 Hannover — 4School of Chemistry (BK21), Seoul National University, Seoul 151-747, Republic of Korea
An initially populated spin manifold interacting with an external field can decay via spin-coupling or via ionization. Using a simple two-level Hamiltonian we investigate the relation between spin coupling and ionization rate and identify conditions for an efficient spin-control by suppressing ionization. The results are confirmed in solving the time-dependent Schrödinger equation for the interaction of a laser field with a spin-coupled model system where two electrons and a nucleus move in a collinear configuration. It is thus shown, that quantum control of intersystem crossing can indeed be effective if the intensity of the external field and the accompanying Stark-shift is adjusted properly to the spin coupling-strength.