Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 131, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3202437
Keywords
excited states; molecule-photon collisions; nonlinear optics; organic compounds; polarisability; PPP calculations; renormalisation; two-photon spectra
Funding
- Department of Science and Technology [SR/S2/CMP-24/2003]
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We have used the density matrix renormalization group (DMRG) method to study the linear and nonlinear optical responses of first generation nitrogen based dendrimers with donor acceptor groups. We have employed Pariser-Parr-Pople Hamiltonian to model the interacting pi electrons in these systems. Within the DMRG method we have used an innovative scheme to target excited states with large transition dipole to the ground state. This method reproduces exact optical gaps and polarization in systems where exact diagonalization of the Hamiltonian is possible. We have used a correction vector method which tacitly takes into account the contribution of all excited states, to obtain the ground state polarizibility, first hyperpolarizibility, and two photon absorption cross sections. We find that the lowest optical excitations as well as the lowest excited triplet states are localized. It is interesting to note that the first hyperpolarizibility saturates more rapidly with system size compared to linear polarizibility unlike that of linear polyenes.
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