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Published on: January 10, 2025
A Simple One-Body Approach to the Calculation of the First Electronic Absorption Band of Water
Ricardo A Mata1, Hermann Stoll1, B J Costa Cabral1
1Grupo de Física-Matemática da Universidade de Lisboa, Avenue Professor Gama Pinto 2, 1649-003 Lisboa, Portugal, Institut für Theoretische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany, and Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisboa, Portugal.
Abstract:
A one-body decomposition approach for investigating the electronic absorption spectra of molecular systems was proposed and applied to water clusters (H2O)N including up to N = 80 water molecules. Two specific aspects of the present implementation are the inclusion of the coupling between excited states and a simplified representation for the N-body Coulombic effects. For smaller clusters, the results based on the one-body decomposition scheme are in good agreement with full EOM-CCSD calculations. Two different regimes can be identified in the electronic absorption profile of larger water clusters. The first low-energy regime is dominated by local excitonic states on the cluster surface, whereas the higher-energy excitations associated with the second one are of delocalized nature.
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