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Ab initio calculations on small hydrides including electron correlation

I. The BeH2 molecule in its ground state

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Abstract

A method of calculating directly approximate natural orbitals in the electron pair approximation is applied to the ground state of the BeH2 molecule, which is not known from experiment. The question of optimum localization of the electron pairs for asymmetric nuclear configuration receives particular attention. The interpair correlation energy is estimated. The physical properties of the molecule are predicted and experimental conditions are indicated under which it should be observed.

Zusammenfassung

Die Methode zur direkten Berechnung genäherter natürlicher Orbitale in der Elektronenpaar-näherung wird auf den Grundzustand des vom Experiment her unbekannten BeH2-Moleküls angewandt. Die Frage der optimalen Lokalisierung der Elektronenpaare für asymmetrische Anordnung der Kerne findet besonderes Interesse. Die Interpaar-Korrelationsenergie wird abgeschätzt. Die vorausgesagten physikalischen Eigenschaften dieses Moleküls sind in einer Tabelle zusammengestellt. Bedingungen, unter denen das Molekül experimentell beobachtet werden sollte, werden angegeben.

Résumé

La méthode basée sur le calcul direct des orbitales naturelles approchées est appliquée á l'étude de l'état fondamental de la molécule BeH2 qui est inconnu du point de vue expérimental. La question de la localisation optimale des paires d'électrons pour des configurations asymmétriques des noyaux est discutée en détail. La corrélation interpaires est estimée. On prédit les propriétés physiques de la molécule et on indique les conditions qui devraient permettre de l'observer.

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Ahlrichs, R., Kutzelnigg, W. Ab initio calculations on small hydrides including electron correlation. Theoret. Chim. Acta 10, 377–387 (1968). https://doi.org/10.1007/BF00528769

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  • DOI: https://doi.org/10.1007/BF00528769

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