期刊
JOURNAL OF CHEMICAL PHYSICS
卷 134, 期 24, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.3603445
关键词
density functional theory; molecular electronic states; Newton method; orbital calculations
资金
- Magnus Ehrnrooth foundation [MA2010n3]
We compare three different methods for direct energy minimization in electronic structure calculations where the gradient of the energy functional with respect to the molecular orbitals is available. These methods make use of the preconditioned gradient to increase robustness. An orbital transformation is used to ensure that the orthogonality constraint on the orbitals remains satisfied when using standard minimization methods. In addition, we propose an adaptive scheme for estimating the curvature of the energy functional to increase the performance of a line search free quasi-Newton method. We show that the performance of all methods is similar when robustness of the methods is ensured. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3603445]
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