We present a novel application of best -term approximation theory in the framework of electronic structure calculations. The paper focusses on the description of electron correlations within a Jastrow-type ansatz for the wavefunction. As a starting point we discuss certain natural assumptions on the asymptotic behaviour of two-particle correlation functions near electron-electron and electron-nuclear cusps. Based on Nitsche’s characterization of best -term approximation spaces , we prove that for and with respect to a certain class of anisotropic wavelet tensor product bases. Computational arguments are given in favour of this specific class compared to other possible tensor product bases. Finally, we compare the approximation properties of wavelet bases with standard gaussian-type basis sets frequently used in quantum chemistry.
@article{M2AN_2007__41_2_261_0,
author = {Flad, Heinz-J\"urgen and Hackbusch, Wolfgang and Schneider, Reinhold},
title = {Best $N$-term approximation in electronic structure calculations. II. Jastrow factors},
journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique},
volume = {41},
year = {2007},
pages = {261-279},
doi = {10.1051/m2an:2007016},
mrnumber = {2339628},
zbl = {1135.81029},
language = {en},
url = {http://dml.mathdoc.fr/item/M2AN_2007__41_2_261_0}
}
Flad, Heinz-Jürgen; Hackbusch, Wolfgang; Schneider, Reinhold. Best $N$-term approximation in electronic structure calculations. II. Jastrow factors. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Tome 41 (2007) pp. 261-279. doi : 10.1051/m2an:2007016. http://gdmltest.u-ga.fr/item/M2AN_2007__41_2_261_0/
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