DOI: 10.1063/1.460696. Accurate multireference configuration interaction calculations of the potential energy function and the dissociation energy of N2

Accurate multireference configuration interaction calculations of the potential energy function and the dissociation energy of N2

10.1063/1.460696

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

The potential energy function of the N2 molecule is calculated using the internally contracted multireference CI method (CMRCI) and complete active space SCF (CASSCF) reference wave functions. A full CI calculation in a DZP basis set is used to estimate the errors associated with the CMRCI wave function. The dependence of the computed spectroscopic constants and the dissociation energy on the basis set is also investigated. Uncontracted and segmented basis sets are compared with ANO (atomic natural orbital) and other generally contracted basis sets. It is found that the energy optimized ‘‘correlation consistent’’ basis sets of Dunning yield substantially better results than ANO basis sets of the same size. In the largest calculations, which included up to h type basis functions and also accounted for core–core and core–valence correlation effects, the remaining errors are 0. 0003 Å, 8 cm−1, and 0.7 kcal/mol for re, ωe, and De, respectively. The inclusion of an i type basis function reduces the error in the dissociation energy to 0.3 kcal/mol (0.013 eV).

Bibliography

Werner, H.-J., & Knowles, P. J. (1991). Accurate multireference configuration interaction calculations of the potential energy function and the dissociation energy of N2. The Journal of Chemical Physics, 94(2), 1264â1270.

Authors 2

Hans-Joachim Werner (first)
Peter J. Knowles (additional)

References 23 Referenced 80

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 8:20 a.m.)
Deposited	1 year, 6 months ago (Feb. 10, 2024, 7:25 a.m.)
Indexed	1 year, 6 months ago (Feb. 13, 2024, 3:53 a.m.)
Issued	34 years, 7 months ago (Jan. 15, 1991)
Published	34 years, 7 months ago (Jan. 15, 1991)
Published Print	34 years, 7 months ago (Jan. 15, 1991)

Funders 0

None

BibTeX

@article{Werner_1991, title={Accurate multireference configuration interaction calculations of the potential energy function and the dissociation energy of N2}, volume={94}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.460696}, DOI={10.1063/1.460696}, number={2}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Werner, Hans-Joachim and Knowles, Peter J.}, year={1991}, month=jan, pages={1264–1270} }

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