Physics – Chemical Physics
Scientific paper
2007-04-16
J. Phys. Chem. A, v.111, pp9560-9569 (2007)
Physics
Chemical Physics
38 pages, 7 figures; submitted to JPC
Scientific paper
The influence of excited-state absorption (ESA) and two-exciton processes on a coherent population transfer with intense ultrashort chirped pulses in molecular systems in solution has been studied. An unified treatment of adiabatic rapid passage (ARP) in such systems has been developed using a three-state electronic system with relaxation treated as a diffusion on electronic potential energy surfaces. We have shown that ESA has a profound effect on coherent population transfer in large molecules that necessitates a more accurate interpretation of experimental data. A simple and physically clear model for ARP in molecules with three electronic states in solution has been developed by extending the Landau-Zener calculations putting in a third level to random crossing of levels. A method for quantum control of two-exciton states in molecular complexes has been proposed.
Fainberg Boris D.
Gorbunov V. A.
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