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Nonlinear Absorption Dynamics Using Field-Induced Surface Hopping: Zinc Porphyrin in Water

Authors

  • Merle I. S. Röhr,

    1. Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin (Germany)
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  • Jens Petersen,

    1. Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin (Germany)
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  • Matthias Wohlgemuth,

    1. Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin (Germany)
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  • Prof. Dr. Vlasta Bonačić-Koutecký,

    Corresponding author
    1. Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Straße 2, 12489 Berlin (Germany)
    2. Interdisciplinary Center for Advanced Science and Technology, University of Split, Meštrovićevo Šetalište 45, 21000 Split (Croatia)
    • Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Straße 2, 12489 Berlin (Germany)
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  • Prof. Dr. Roland Mitrić

    Corresponding author
    1. Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin (Germany)
    2. Julius-Maximilians-Universität Würzburg, Institut für Physikalische und Theoretische Chemie, Emil-Fischer-Straße 42, 97074 Würzburg (Germany)
    • Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin (Germany)
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Abstract

We wish to present the application of our field-induced surface-hopping (FISH) method to simulate nonlinear absorption dynamics induced by strong nonresonant laser fields. We provide a systematic comparison of the FISH approach with exact quantum dynamics simulations on a multistate model system and demonstrate that FISH allows for accurate simulations of nonlinear excitation processes including multiphoton electronic transitions. In particular, two different approaches for simulating two-photon transitions are compared. The first approach is essentially exact and involves the solution of the time-dependent Schrödinger equation in an extended manifold of excited states, while in the second one only transiently populated nonessential states are replaced by an effective quadratic coupling term, and dynamics is performed in a considerably smaller manifold of states. We illustrate the applicability of our method to complex molecular systems by simulating the linear and nonlinear laser-driven dynamics in zinc (Zn) porphyrin in the gas phase and in water. For this purpose, the FISH approach is connected with the quantum mechanical-molecular mechanical approach (QM/MM) which is generally applicable to large classes of complex systems. Our findings that multiphoton absorption and dynamics increase the population of higher excited states of Zn porphyrin in the nonlinear regime, in particular in solution, provides a means for manipulating excited-state properties, such as transient absorption dynamics and electronic relaxation.

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