AbstractA first-principles approach is reviewed for calculating the total energy of chain polymers using a linear combination of atomic orbitals local-density functional approach. The geometry for the all-trans conformation of polysilane is optimized by finding the minimum energy structure using this method.
ABSTRACTWe have calculated the electronic structure of icosahedrai C60H60 and tetrahedral C60H60 via an all-electron Gaussian-orbital based local-density functional approach. The one-electron wavefunctions and eigenvalues have been used in a first-order time-dependent perturbation theoretic calculation of the spherically averaged X-ray and ultraviolet pho-toemission cross-sections for these molecules.
First-principles calculation of effective onsite Coulomb interactions of3dtransition metals: Constrained local density functional approach with maximally localized Wannier functions