Analytic Molecular Hessian Calculations for CC2 and MP2 Combined with the Resolution of Identity Approximation.
Analytic Molecular Hessian Calculations for CC2 and MP2 Combined with the Resolution of Identity Approximation.
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CC2 和 MP2 的解析分子 Hessian 计算与身份近似解析相结合
DOI:
10.1021/ct400034t
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发表时间:
2013
影响因子:
5.5
通讯作者:
Jörg Koßmann
中科院分区:
文献类型:
--
作者:
Daniel H. Friese;Christof Hättig;Jörg Koßmann
An implementation of analytic second derivatives for the approximate coupled cluster singles and doubles model CC2 and for second-order Møller–Plesset perturbation theory (MP2) will be presented. The RI approximation for the two-electron repulsion integrals is used to reduce memory demands, operation count, and I/O requirements. During the calculation, the storage ofquantities (whereis a measure for the system size) can completely be avoided. It is shown that with the MP2 method and an appropriate scaling of the harmonic frequencies, especially C–F stretch frequencies are reproduced much better in comparison to experiments than with the B3LYP density functional. Similar advantages are observed for molecules with strong, internal van der Waals interactions. Spin scaling offers additional improvements in these cases. The implementation has been tested for molecules with up to 81 atoms and 684 basis functions.
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DOI:
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发表时间:
1966
期刊:
影响因子:
--
作者:
D. M. Bishop;M. Randic
通讯作者:
M. Randic
DOI:
10.1063/1.4704788
发表时间:
2012
期刊:
The Journal of chemical physics
影响因子:
--
作者:
Daniel H. Friese;Nina O. C. Winter;Patrick Balzerowski;Raffael Schwan;Christof Hättig
通讯作者:
Christof Hättig
DOI:
--
发表时间:
2000
期刊:
影响因子:
--
作者:
J. Gauss;J. Stanton
通讯作者:
J. Stanton
DOI:
--
发表时间:
1972
期刊:
影响因子:
--
作者:
H. Hope;J. Bernstein;K. Trueblood
通讯作者:
K. Trueblood
DOI:
--
发表时间:
1984
期刊:
影响因子:
--
作者:
A. Ron;M. Noble;Edward K. C. Lee
通讯作者:
Edward K. C. Lee