Holstein–Peirls–Hubbard trimer as a model for quadrupolar two-photon absorbing dyes
Literature Information
Robertino Pilot, Renato Bozio
The linear and nonlinear optical properties of a Donor–Acceptor–Donor system have been investigated by using a two-electron three-point-site model system. Some basic features of electron correlations are included in the model by means of a bi-electronic density matrix. The polarizabilities and second hyperpolarizabilities have been computed with a modified version of the Collective Electronic Oscillators (CEO) method which allowed us to include the electron–phonon coupling. Both singly- and doubly-excited states are taken into account in the computation of (hyper-)polarizabilities. The effects of electron–phonon coupling on the two-photon absorption and on the third harmonic generation in the infrared region are discussed.
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Source Journal
Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.










![N-[4-(Cyanoethynyl)phenyl]-16-oxo-4,7,10,13-tetraoxa-17-azahenicos-1-yn-21-amide structure N-[4-(Cyanoethynyl)phenyl]-16-oxo-4,7,10,13-tetraoxa-17-azahenicos-1-yn-21-amide structure](https://static.chemtradehub.com/structs/218/2183440-36-8-68cb.webp)



amine structure [(2-chlorophenyl)methyl](ethyl)amine structure](https://static.chemtradehub.com/structs/629/62924-61-2-0728.webp)