红肿
发表于 2025-3-30 11:04:49
Laguerre Polynomials, Reminiscences from Uppsala, odd jobs in the office like pasting Physics Abstract cuttings on sheets of white paper and helping the secretaries with the binding of Technical Reports. In the meantime I was busy reading Löwdin’s articles trying to learn and understand his approach to quantum chemistry. After a few months Profess
蜿蜒而流
发表于 2025-3-30 14:11:32
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评论性
发表于 2025-3-30 18:25:05
The Non-Orthogonality Problem and Orthogonalization Procedures,nal one to another /5/. The problem was at the same time a physical and a mathematical one, as will be illustrated below. Löwdin’s work (/6/ and references given later) played a decisive role in formulating correctly and analyzing this problem.
BOGUS
发表于 2025-3-30 22:16:08
Importance of Overlap in the Analysis of Weak Exchange Interactions by Perturbation Methods,ey often play an essential role in problems of molecular stability and conformation, of the cohesive energy of insulators and metals, magnetic ordering in solids with paramagnetic cations; etc. Their accurate evaluation is, consequently, a conditio sine qua non for any satisfactory theoretical analysis of properties of condensed matter.
毗邻
发表于 2025-3-31 04:54:09
Test of the Conventional Quantum Chemistry Methods on the Hydrogen Atom,xponentials, exp(-kηr); k = 1, 2...N. N is the .rder of the basis set and η is the scale factor. Scaled functions φ. are obtained from the unscaled ones φ. in the usual way /1/: .Both sets become complete in the interval 0≤r≤∞ when N→∞ and, for both, all the necessary integrals are elementary.
发微光
发表于 2025-3-31 06:44:08
Book 1976tific and organizational - of an individual person. Scientific achievement cannot be subjected to the very refined measurement techniques of science itself, but there is a continuous mutual evaluation among scientists which manifests itself through refereeing, literature citation and dedicatory volu
馆长
发表于 2025-3-31 09:21:22
,Acta Vålådalensia Revisited: Per-Olov Löwdin in Scientific Discussion,n, Sweden, in 1958. It finished with a panel discussion which is a precursor of the many Symposia in Florida and Scandinavia. A rather complete version of the proceedings was circulated as Technical Note 16 (no longer available) from the Uppsala Quantum Chemistry Group. It had the unofficial name of Acta Vålådalensia.
chance
发表于 2025-3-31 16:43:12
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harbinger
发表于 2025-3-31 18:02:30
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sebaceous-gland
发表于 2025-3-31 21:56:27
,Numerical Aspects of Weyl’s Theory,ortional to the spectral density. In fact, as shown in detail by Chaudhuri and Everitt /3/, the spectrum of singular second order differential operators is completely characterized by the analytic properties of the m-function on the real axis.