Paper Citing NAMD - Abstract
Zhu, Hui; May, Volkhard; Roeder, Beate
Mixed quantum classical simulations of electronic excitation energy transfer: The pheophorbide-a DAB dendrimer P-4 in solution
CHEMICAL PHYSICS, 351:117-128, JUL 3 2008
Photoinduced electronic excitation energy transfer in chromophore complexes is studied by utilizing a mixed quantum classical methodology. Electronic excitations are characterized by a Frenkel-exciton model and treated quantum mechanically while all nuclear coordinates are described classically finally by carrying out room-temperature IVID simulations. The theory is applied to the chromophore complex P4 dissolved in ethanol. P4 is formed by a butanediamine dendrimer to which four pheophorbide-a molecules have been covalently linked. The P4 excited electronic states have to be described in an improved exciton model which accounts for charge distributions in the chromophores electronic ground and excited state. It also includes a correct description of the excitonic coupling among different chromophores based on the introduction of atomic centered transition charges. Excitation energy transfer is discussed in using adiabatic exciton states as well as a full solution of the time-dependent Schr6dinger equation. To underline the effect of strong excitonic coupling emphasis is also placed on IVID runs where two chromophores are positioned close together. Relations are discussed to the standard treatment of exciton dynamics in using the density matrix theory as well as by introducing rate equations based on rate expressions according to Forster. (c) 2008 Elsevier B.V. All rights reserved.
