The photo-orientation of azobenzene in viscous solutions, simulated by a stochastic model
Literature Information
Valentina Cantatore, Giovanni Granucci, Maurizio Persico
We report a computational study of the photo-orientation kinetics in a viscous solution of azobenzene in ethylene glycol, under irradiation with linearly polarized light. The development of anisotropy and its interplay with photoisomerization are simulated by a stochastic model. A distinctive feature of the model is that it takes into account the photo-orientation angular distributions, specific for each isomer, obtained by nonadiabatic dynamics simulations at the molecular level. We find that the anisotropy, as measured by optical absorption dichroism, does not necessarily increase monotonously with time. As expected, the photo-orientation turns out to be strongly coupled with photoisomerization, but the latter is not a mandatory ingredient of this phenomenon: we predict that any chromophore undergoing large amplitude geometry relaxation during its excited state dynamics can develop anisotropy under suitable conditions.
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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.














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