首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Intermolecular forces and molecular dynamics simulation of 1,3,5-Triamino-2,4,6-trinitrobenzene (TATB) using symmetry adapted perturbation theory
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Intermolecular forces and molecular dynamics simulation of 1,3,5-Triamino-2,4,6-trinitrobenzene (TATB) using symmetry adapted perturbation theory

机译:1,3,5-三氨基-2,4,6-三硝基苯(TATB)的分子间力和分子动力学模拟的对称自适应扰动理论

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摘要

The dimer potential energy surface (PES) of 1,3,5-triamino-2,4,6- trinitrobenzene (TATB) has been explored using symmetry adapted perturbation theory based on a Kohn-Sham density functional theory description of the monomers [SAPT(DFT)]. An intermolecular potential energy function was parametrized using a grid of 880 ab initio SAPT(DFT) dimer interaction energies, and the function was used to identify stationary points on the SAPT(DFT) dimer PES. It is shown that there exists a variety of minima with a range of bonding configurations and ab initio analyses of the interaction energy components, along with radial cross sections of the PES near each minimum, are presented. Results of isothermal-isostress molecular dynamics simulations are reported, and the simulated structure, thermal expansion, sublimation enthalpy, and bulk modulus of the TATB crystal, based on the SAPT(DFT) interaction potential, are in good agreement with experiment.
机译:基于单体的Kohn-Sham密度泛函理论描述[SAPT],使用对称适应扰动理论研究了1,3,5-三氨基-2,4,6-三硝基苯(TATB)的二聚体势能表面(PES)。 ((DFT)]。使用880 ab从头算SAPT(DFT)二聚体相互作用能的网格对分子间势能函数进行参数化,并将该函数用于识别SAPT(DFT)二聚体PES上的固定点。结果表明,存在多种具有一系列键合构型的极小值,并且对相互作用能分量从头开始进行了分析,并给出了每个最小附近的PES的径向截面。报道了等温-等应力分子动力学模拟的结果,并且基于SAPT(DFT)相互作用势的TATB晶体的模拟结构,热膨胀,升华焓和体积模量与实验吻合良好。

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