Plane waves basis sets in the description of diatomic anions and valence charge density
- 8 November 1996
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 105 (18) , 8231-8236
- https://doi.org/10.1063/1.472701
Abstract
The performance of plane wavebasis sets to describe bond lengths, and vibrational frequencies for diatomic anions is described within the context of ab initio total energy density functional pseudopotential method. Also, the behavior of the charge density as a function of the plane wave expansion size is studied for a molecule containing C, H, O, N, and S atoms. For the three properties studied, a critical size of the basis set that assures a reasonable description of them was found. These critical values are around a cutoff energy of at least 20 Ry below the cutoff energy used to design the pseudopotentials.Keywords
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