The X3LYP extended density functional for accurate descriptions of nonbond interactions, spin states, and thermochemical properties We suggest that X3LYP will be useful for predicting ligand binding in proteins and DNA. X3LYP also leads to a good description of dipole moments, polarizabilities, and accurate excitation energies from s to d orbitals for transition metal atoms and ions. Based on this, we develop the X3LYP (extended hybrid functional combined with Lee-Yang-Parr correlation functional) extended functional for density functional theory to significantly improve the accuracy for hydrogen-bonded and van der Waals complexes while also improving the accuracy in heats of formation, ionization potentials, electron affinities, and total atomic energies. We derive the form for an exact exchange energy density for a density decaying with Gaussian-like behavior at long range. From The Cover: The X3LYP extended density functional for accurate descriptions of nonbond interactions, spin states, and thermochemical properties
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