2024/06/11 by Maciej Hendzel, Hendzel, Maciej, J. Spałek +1
Chemistry · Physics and Astronomy · #Advanced Chemical Physics Studies #Chemical Physics (physics.chem-ph) #Chemical Reactions and Mechanisms #FOS: Physical sciences #Photochemistry and Electron Transfer Studies #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.2406.07729
openalex publication_date 2024/06/11 · openalex created_date 2024/06/15 · openalex updated_date 2026/07/28
We present a detailed investigation of the electronic structure and bonding characteristics of hydrogen-based molecular systems (\chH2+, \chH2, \chH2-) using the Exact Diagonalization Ab Initio (EDABI) approach within the framework of combined first- and second-quantization. By analyzing the relative contributions of kinetic exchange and effective Coulomb interactions, we provide a comprehensive understanding of covalency, atomicity, and ionicity as a function of interatomic distances. Our approach leverages exact solutions of the extended Heitler-London model to quantify these interactions, extending the analysis to the discussion of properties of excited states and the dissociation limit to these molecules. The findings reveal significant differences in bonding characteristics, particularly highlighting the stability and bonding nature of the neutral \chH2 molecule compared to its ionic counterparts. This study not only enhances an understanding of molecular interactions in hydrogen systems but also demonstrates the potential of the EDABI approach in developing more accurate computational models in quantum chemistry.