Objective
This project covers two principal points. The first point is about a variational method for obtaining localized orbitals. This approach has been recently proposed and implemented in a preliminary way in the Laboratoire de Physique Quantique (LPQ) of Toulouse University. Working with local orbitals induces a hierarchy in the importance of the Slater determinants in a large CI basis. This makes possible to eliminate those determinants whose weight in the CAS wave function is negligible, and to replace therefore the CAS expansion by a (usually much shorter) MR expansion. Part of the work will be to replace the variational approach with a perturbative one, the implementation of a reduced transformation of the two-electron molecular integrals and the possibility of neglecting the interaction between distant regions of the system. A second point is the application of this technique in the calculation of realistic systems covering different fields. In some electronic spectroscopy problem a local approach can produce important results. For example, in excitation processes of a cromophore group in a large molecule with a MR description of the orbitals located in the cromophore region, or in large delocalized biological systems ( e.g. the pi/pi* excitation in retinal). It is crucial to test the sensitivity of local approaches to far substituents shifts. In the study of the mixed-valence and magnetic systems the local descriptions are easier to interpret in accord to magnetic hamiltonians so that both the exchange and Coulomb parameters will be easier to get.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
31062 Toulouse
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.