Fast Time-Dependent Density Functional Theory Calculations of the X-ray Absorption Spectroscopy of Large Systems.
Fast Time-Dependent Density Functional Theory Calculations of the X-ray Absorption Spectroscopy of Large Systems.
复制标题
大型系统 X 射线吸收光谱的快速瞬态密度泛函理论计算。
DOI:
10.1021/acs.jctc.6b00656
复制
发表时间:
2016
影响因子:
5.5
通讯作者:
Besley NA
中科院分区:
文献类型:
--
作者:
Besley NA
The computational cost of calculations ofK-edge X-ray absorption spectra using time-dependent density functional (TDDFT) within the Tamm–Dancoff approximation is significantly reduced through the introduction of a severe integral screening procedure that includes only integrals that involve the coresbasis function of the absorbing atom(s) coupled with a reduced quality numerical quadrature for integrals associated with the exchange and correlation functionals. The memory required for the calculations is reduced through construction of the TDDFT matrix within the absorbing core orbitals excitation space and exploiting further truncation of the virtual orbital space. The resulting method, denoted fTDDFTs, leads to much faster calculations and makes the study of large systems tractable. The capability of the method is demonstrated through calculations of the X-ray absorption spectra at the carbonK-edge of chlorophylla, C60and C70.
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