UNSPECIFIED. (2003) The multiconfiguration equations for atoms and molecules: Charge quantization and existence of solutions. ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS, 169 (1). pp. 35-71. ISSN 0003-9527

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Abstract

We prove the existence of ground-state solutions for the multiconfiguration self-consistent field equations for atoms and molecules whenever the total nuclear charge Z exceeds N-1, where N is the number of electrons. Moreover, we show that for arbitrary values of Z and N the scattering charge, i.e., the asymptotic amount of charge lost by an energy-minimizing sequence, is integer-quantized. Our analysis applies to the MC equations of arbitrary rank. As special cases we recover, in a new and unified way, the existence theorems of Zhislin [Zh60] for the N-body Schrodinger equation (infinite rank MC) and of Lieb & Simon [LS77] for the Hartree-Fock equations (rank-N MC). Our approach is a direct study of an invariant, orbital-free formulation in N-body space of the underlying variational principle. Proofs involve (i) the geometric N-body localization methods for the linear Schrodinger equation first introduced by Enss [En77] (and developed in [Sim77, Sig82]), which can be adapted to become powerful tools in nonlinear many-body theory as well, (ii) weak convergence methods from the theory of nonlinear partial differential equations, (iii) careful analysis of the structure of the one- and two-body density matrices of the bound and scattering fragments delivered by geometric localization, which allows us to overcome the fact that the rank of the fragments is not reduced by localization.

Item Type:	Journal Article
Subjects:	Q Science > QA Mathematics T Technology > TJ Mechanical engineering and machinery
Journal or Publication Title:	ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS
Publisher:	SPRINGER-VERLAG
ISSN:	0003-9527
Date:	August 2003
Volume:	169
Number:	1
Number of Pages:	37
Page Range:	pp. 35-71
Identification Number:	10.1007/s00205-003-0252-y
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/9415

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