Incremental CCSD(T)(F12)|MP2-F12-A Method to Obtain Highly Accurate CCSD(T) Energies for Large Molecules.

Incremental CCSD(T)(F12)|MP2-F12-A Method to Obtain Highly Accurate CCSD(T) Energies for Large Molecules.
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增量 CCSD(T)(F12)|MP2-F12-A 获得大分子高精度 CCSD(T) 能量的方法

DOI:
10.1021/ct300938w
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发表时间:
2013
影响因子:
5.5
通讯作者:
K. Walczak
K. Walczak
中科院分区:
化学1区
文献类型:
--
作者:
J. Friedrich;K. Walczak

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在这项工作中,我们应用最近提出的MP2修正的增量能量域特定的基组方法,以增量扩展CCSD(T)(F12)的能量。该方法测试了一组27个分子具有不同的电子结构,包括水簇,水络合物,脂肪族烃,烯烃,炔,芳香族系统,和氨基酸。相对于标准计算的绝对能量的均方根偏差为1.7 kJ/mol,平均绝对偏差为1.2 kJ/mol,范围为4.7 kJ/mol。计算的壁时间由于双并行策略的应用而减少-独立耦合集群计算并行地在多达70个节点上执行,并且另外在一个节点上的计算用TURBOMOLE中的SMP并行化耦合集群代码执行。使用这种策略,我们可以在几分钟或几小时内执行计算,而不是几天或几个月。应用所提出的方案使我们能够在CCSD(T)(F12)水平上结合适当的基组来常规地处理具有50个原子的系统,以获得接近CBS的精度。此外,更大的系统仍然是可行的一个标准的集群证明H3 O+(H2O)25 Cl-与80个原子。
In this work, we apply the recently proposed MP2 correction to incremental energies within the domain-specific basis set approach to incrementally expanded CCSD(T)(F12) energies. The approach is tested for a set of 27 molecules with different electronic structures including water clusters, aqua complexes, aliphatic hydrocarbons, alkenes, alkynes, aromatic systems, and amino acids. The root mean squared deviation of the absolute energies with respect to the standard calculation is 1.7 kJ/mol, the mean absolute deviation is 1.2 kJ/mol, and the range is 4.7 kJ/mol. The wall time of the computations is reduced due to the application of a doubly parallel strategythe independent coupled cluster calculations are performed on up to 70 nodes in parallel, and in addition the computations on one node are performed with the SMP-parallelized coupled cluster code in TURBOMOLE. Using this strategy, we can perform computations in minutes or hours, instead of days or months. Applying the proposed scheme enables us to routinely treat systems with 50 atoms at the CCSD(T)(F12) level in combination with appropriate basis sets to obtain nearly CBS accuracy. Also, larger systems are still feasible on a standard cluster as demonstrated for H3O+(H2O)25Cl–with 80 atoms.
局部相关方法中的势能面不连续性。
DOI: 10.1063/1.1759322
发表时间: 2004
期刊: The Journal of chemical physics
影响因子: --
作者:
N. J. Russ;T. Crawford
通讯作者: T. Crawford
DOI: 10.1063/1.4719981
发表时间: 2011-08
期刊: The Journal of chemical physics
影响因子: --
作者:
C. Hättig;D. Tew;Benjamin Helmich
通讯作者: C. Hättig;D. Tew;Benjamin Helmich
使用尖点条件实施 CCSD(T)-F12 方法。
DOI: --
发表时间: 2008
期刊: Physical Chemistry, Chemical Physics - PCCP
影响因子: --
作者:
D. Bokhan;S. Ten;J. Noga
通讯作者: J. Noga
DOI: 10.1063/1.1757439
发表时间: 2004
期刊: The Journal of chemical physics
影响因子: --
作者:
S. Ten
通讯作者: S. Ten
增量方案的能量筛选:在分子间相互作用中的应用。
DOI: 10.1021/jp072256y
发表时间: 2007
期刊: The journal of physical chemistry. A
影响因子: --
作者:
J. Friedrich;M. Hanrath;M. Dolg
通讯作者: M. Dolg