Title: Ab initio potential energy curve for the helium atom pair and thermophysical properties of dilute helium gas. I. Helium-helium interatomic potential
Authors: Hellmann, Robert 
Bich, Eckard
Vogel, Eckhard
Language: eng
Keywords: Ab initio;Computational chemistry;Electronic structure;Helium pair potential;Quantum chemistry
Issue Date: 1-Dec-2007
Document Type: Article
Journal / Series / Working Paper (HSU): Molecular Physics
Volume: 105
Issue: 23-24
Page Start: 3013
Page End: 3023
A helium-helium interatomic potential energy curve was determined from quantum-mechanical ab initio calculations. Very large atom-centred basis sets including a newly developed d-aug-cc-pV8Z basis set supplemented with bond functions and ab initio methods up to full CI were applied. The aug-cc-pV7Z basis set of Gdanitz (J. Chem. Phys. 113, 5145 (2000)) was modified to be more consistent with the aug-cc-pV5Z and aug-cc-pV6Z basis sets. The diagonal Born-Oppenheimer corrections as well as corrections for relativistic effects were also calculated. A new analytical representation of the interatomic potential energy was fitted to the ab initio calculated values. In a following paper this potential model will be used in the framework of quantum-statistical mechanics and of the corresponding kinetic theory to calculate the most important thermophysical properties of helium governed by two-body and three-body interactions.
Organization Units (connected with the publication): Universit├Ąt Rostock
ISSN: 00268976
Publisher DOI: 10.1080/00268970701730096
Appears in Collections:Publications of the HSU Researchers (before HSU)

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