Int. J. Mol. Sci. 2002, 3(5), 498-507; doi:10.3390/i3050498
Article

Potential Functions of Al2 by the Relativistic Fock-Space Coupled Cluster Method

Received: 4 December 2001; Accepted: 4 February 2002 / Published: 31 May 2002
(This article belongs to the Special Issue Recent Advances in Coupled Cluster Theory)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Potential functions of the ground and low excited states of Al2 are calculated by the relativistic Fock-space coupled cluster method in the framework of the projected Dirac-Coulomb Hamiltonian. A moderate-size basis [16s11p3d3f/6s6p3d2f] is used. 3Πu is confirmed as the ground state of the system. Its spin orbit splittings are reproduced well, with the Λ = 1, 2 states lying 32.5 and 66.1 cm−1, respectively, above the Λ = 0 minimum (experimental values are 30.4 and 63.4 cm−1). The bond is somewhat too weak, with De 0.14 eV below experiment, Re too high by 0.08 ˚A, and ωe 21 cm−1 too low. It is speculated that the better agreement obtained in earlier calculations may be due to neglect of basis set superposition errors. The description of bonding in the molecule may be improved by the use of a better basis and the inclusion of more correlation by the intermediate Hamiltonian coupled cluster method, which makes it possible to handle larger P spaces and extend the potential functions to the whole range of internuclear separations.
Keywords: Aluminum dimer; Relativistic coupled cluster; Intermediate Hamiltonian coupled cluster
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MDPI and ACS Style

Landau, A.; Eliav, E.; Visscher, L.; Kaldor, U. Potential Functions of Al2 by the Relativistic Fock-Space Coupled Cluster Method. Int. J. Mol. Sci. 2002, 3, 498-507.

AMA Style

Landau A, Eliav E, Visscher L, Kaldor U. Potential Functions of Al2 by the Relativistic Fock-Space Coupled Cluster Method. International Journal of Molecular Sciences. 2002; 3(5):498-507.

Chicago/Turabian Style

Landau, Arie; Eliav, Ephraim; Visscher, Lucas; Kaldor, Uzi. 2002. "Potential Functions of Al2 by the Relativistic Fock-Space Coupled Cluster Method." Int. J. Mol. Sci. 3, no. 5: 498-507.

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