Münster 1999 – wissenschaftliches Programm

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CP: Chemische Physik

CP 7: Spektroskopie

CP 7.1: Vortrag

Montag, 22. März 1999, 14:00–14:15, Gg

Memory effects in the light-driven dissipative dynamics of molecular system — •T. Mančal, D. H. Schirrmeister, and V. May — Institut für Physik, Humboldt Universität zu Berlin

Utilizing the density matrix theory the spatial-temporal behavior is investigated for an open molecular system excited by a femtosecond laser pulse of high intensity. The light-field molecule interaction is treated exactly in both, the reversible as well as the dissipative part of the density matrix equation. It is discussed under which conditions a control of dissipation by ultrafast external field becomes possible. The general approach is applied to a model system of two potential energy surfaces defined versus a single active coordinate and coupled to a thermal reservoir. To study non-Markovian effects of the molecule solvent interaction a special polynomial method is used [1]. Some indications on laser pulse dependent dissipation are given for the dye-molecule IR 125 [2], for which some reference calculations have already been done [3,4]. [1] T. Mančal, J. Bok and L. Skála, J. Phys. A (in press). [2] S. H. Ashworth et al., J. Chem. Phys. 104 (15) 1996. [3] D. H. Schirrmeister and V. May, Chem. Phys. 220 (1997) 1–13. [4] D. H. Schirrmeister and V. May, Chem. Phys. Lett. (in press)