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Full Wave Function Optimization with Quantum Monte Carlo and Its Effect on the Dissociation Energy of FeS

机译:用量子蒙特卡罗的全波函数优化及其对FES解离能的影响

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Diffusion quantum Monte Carlo calculations with partial and full optimization of the guide function are carried out for the dissociation of the FeS molecule. For the first time, quantum Monte Carlo orbital optimization for transition metal compounds is performed. It is demonstrated that energy optimization of the orbitals of a complete active space wave function in the presence of a Jastrow correlation function is required to obtain agreement with the experimental dissociation energy. Furthermore, it is shown that orbital optimization leads to a (5)Delta ground state, in agreement with experiments but in disagreement with other high-level ab initio wave function calculations which all predict a (5)Sigma(+) ground state. The role of the Jastrow factor in DMC calculations with pseudopotentials is investigated. The results suggest that a large Jastrow factor may improve the DMC accuracy substantially at small additional cost.
机译:扩散量子蒙特卡罗计算具有局部和完全优化的引导功能,用于对FES分子的解离。 首次进行过渡金属化合物的量子蒙特卡罗轨道轨道优化。 据证明,在存在Jastow相关函数存在下,可以在存在Jastrow相关函数的情况下进行完整的有效空间波函数的轨道的能量优化来获得与实验解离能的协议。 此外,表明轨道优化与实验一致地导致(5)Δ地面状态,但与其他高级别AB初始波函数计算的分歧,所有这些都预测了(5)Σ(+)地位。 研究了Jastrow系数在DMC计算与伪能量的作用。 结果表明,大的Jastrow因子可以大大提高DMC精度,以小额额外的成本。

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