Titlebook: Quantum Science Methods and Structure; A Tribute to Per-Olo Jean-Louis Calais,Osvaldo Goscinski,Yngve ?hrn Book 1976 Springer Science+Busin

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Inelastic Scattering of Photons from Ionic Crystals and Effects of Overlap,erimental technique in general and the basic theoretical assumptions are discussed. The Compton profile of ionic crystals is evaluated on the basis of a tight-binding (Heitler — London) model and L?wdin’s expansion in terms of overlap integrals. Comparison between experimental and theoretical result

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Test of the Conventional Quantum Chemistry Methods on the Hydrogen Atom,roblem of the hydrogen atom, a case where the quantities of interest are known exactly. The variation principle, δ = 0, is used to approximate energy eigenvalues and the corresponding eigenfunctions. As basis functions, two simple sets are chosen: a) Gaussians, exp(-kηr.); k = 1, 2,...N, and b) e

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,Numerical Aspects of Weyl’s Theory,condition at the right endpoint x = b of the interval [a,b], Weyl /1/ found that m had to lie on a circle in the complex plane. For the singular case, b → ∞, Weyl’s circle shrinks either to a limit circle or to a limit point m.(λ). For most physical examples the differential operator is of limit poi

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