## Presentation

The LCPQ is based at the University of Toulouse. The research at LCPQ covers a large variety of topics dedicated to Theoretical-mostly Quantum- Chemistry and Theoretical Molecular Physics. The LCPQ is member of IRSAMC (The Institute of Research on Complex Atomic and Molecular Systems).

Before 2007 => Look at The Quantum Physics Laboratory HAL-LPQ.

## Publisher copyright policies & self-archiving

Consulter la politique des éditeurs également sur

## Last submission

[hal-02873004] The Bethe-Salpeter Equation Formalism: From Physics to Chemistry  (03/07/2020)   Moins
The many-body Green's function Bethe-Salpeter equation (BSE) formalism is steadily asserting itself as a new efficient and accurate tool in the ensemble of computational methods available to chemists in order to predict optical excitations in molecular systems. In particular, the combination of the so-called $GW$ approximation of many-body perturbation theory, giving access to reliable ionization energies and electron affinities, and the BSE formalism, able to model UV/Vis spectra by catching excitonic effects, has shown to provide accurate singlet excitation energies in many chemical scenarios with a typical error of $0.1$--$0.3$ eV. With a similar computational cost as time-dependent density-functional theory (TD-DFT), the BSE formalism is able to provide an accuracy on par with the most accurate global and range-separated hybrid functionals without the unsettling choice of the exchange-correlation functional, resolving further known issues (e.g., charge-transfer excitations) and offering a well-defined path to dynamical kernels. In this \textit{Perspective} article, we provide a historical overview of the BSE formalism, with a particular focus on its condensed-matter roots. We also propose a critical review of its strengths and weaknesses in different chemical situations. Future directions of developments and improvements are also discussed.

[hal-01814707] Transient metal-centered states mediate isomerization of a photochromic ruthenium-sulfoxide complex  (22/06/2020)   Plus
[hal-02310866] Using Density Functional Theory Based Methods to Investigate the Photophysics of Polycyclic Aromatic Hydrocarbon Radical Cations: A Benchmark Study on Naphthalene, Pyrene and Perylene Cations  (19/06/2020)   Plus
[hal-02534418] Electronic Excited States and UV–Vis Absorption Spectra of the Dihydropyrene/Cyclophanediene Photochromic Couple: a Theoretical Investigation  (23/06/2020)   Plus
[hal-02611130] Multistep Photochemical Reactions of Polypyridine-Based Ruthenium Nitrosyl Complexes in Dimethylsulfoxide  (20/06/2020)   Plus