dorsal/arxiv
View SchemaAccounting for correlations with core electrons by means of the generalized relativistic effective core potentials: Atoms Hg and Pb and their compounds
| Authors | N. S. Mosyagin, A. V. Titov |
|---|---|
| Categories | |
| ArXiv ID | physics/0406143 |
| URL | https://arxiv.org/abs/physics/0406143 |
| DOI | 10.1063/1.1914770 |
Abstract
A way to account for correlations between the chemically active (valence) and innermore (core) electrons in the framework of the generalized relativistic effective core potential (GRECP) method is suggested. The "correlated" GRECP's (CGRECP's) are generated for the Hg and Pb atoms. Only correlations for the external twelve and four electrons of them, correspondingly, should be treated explicitly in the subsequent calculations with these CGRECP's whereas the innermore electrons are excluded from the calculations. Results of atomic calculations with the correlated and earlier GRECP versions are compared with the corresponding all-electron Dirac-Coulomb values. Calculations with the above GRECP's and CGRECP's are also carried out for the lowest-lying states of the HgH molecule and its cation and for the ground state of the PbO molecule as compared to earlier calculations and experimental data. The accuracy for the vibrational frequencies is increased up to an order of magnitude and the errors for the bond lengths (rotational constants) are decreased in about two times when the correlated GRECP's are applied instead of earlier GRECP versions employing the same innercore-outercore-valence partitioning.
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"abstract": "A way to account for correlations between the chemically active (valence) and\ninnermore (core) electrons in the framework of the generalized relativistic\neffective core potential (GRECP) method is suggested. The \"correlated\" GRECP\u0027s\n(CGRECP\u0027s) are generated for the Hg and Pb atoms. Only correlations for the\nexternal twelve and four electrons of them, correspondingly, should be treated\nexplicitly in the subsequent calculations with these CGRECP\u0027s whereas the\ninnermore electrons are excluded from the calculations. Results of atomic\ncalculations with the correlated and earlier GRECP versions are compared with\nthe corresponding all-electron Dirac-Coulomb values. Calculations with the\nabove GRECP\u0027s and CGRECP\u0027s are also carried out for the lowest-lying states of\nthe HgH molecule and its cation and for the ground state of the PbO molecule as\ncompared to earlier calculations and experimental data. The accuracy for the\nvibrational frequencies is increased up to an order of magnitude and the errors\nfor the bond lengths (rotational constants) are decreased in about two times\nwhen the correlated GRECP\u0027s are applied instead of earlier GRECP versions\nemploying the same innercore-outercore-valence partitioning.",
"arxiv_id": "physics/0406143",
"authors": [
"N. S. Mosyagin",
"A. V. Titov"
],
"categories": [
"physics.chem-ph",
"physics.atom-ph"
],
"doi": "10.1063/1.1914770",
"title": "Accounting for correlations with core electrons by means of the generalized relativistic effective core potentials: Atoms Hg and Pb and their compounds",
"url": "https://arxiv.org/abs/physics/0406143"
},
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