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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >An Efficient Approach for Studies of Water Clusters Using Diffusion Monte Carlo
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An Efficient Approach for Studies of Water Clusters Using Diffusion Monte Carlo

机译:使用扩散蒙特卡罗研究水簇的有效方法

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An efficient and accurate approach for using diffusion Monte Carlo (DMC) to study molecular clusters is described and applied to an investigation of (H2O)(n) with n = 1, 2, 3. In this approach, importance sampled DMC is used to describe the intramolecular degrees of freedom of the water monomers. The intermolecular degrees of freedom are treated using standard unguided DMC approaches. This hybrid approach allows us to use significantly smaller simulations to obtain converged zero-point energies and ground state wave functions than would be required for a fully unguided simulation of the same system. We demonstrate the efficiency, accuracy, and utility of this approach through a study of nine isotopologues of water trimer, focusing on how the ground state probability amplitude for these clusters samples the various low-energy minima on the potential surface.
机译:描述并应用用于研究分子簇的扩散蒙特卡罗(DMC)的高效且准确的方法,并施加对N = 1,2,3的调查(H2O)(n),在这种方法中,使用重要性的DMC 描述水单体的分子内自由度。 使用标准的无导DMC方法处理分子间自由度。 这种混合方法允许我们使用明显较小的模拟来获得比相同系统的完全无导体模拟所需的融合零点能量和地面波函数。 我们通过研究九个同位素的水分三聚体来证明这种方法的效率,准确性和效用,专注于这些簇的地位概率幅度如何对电位表面上的各种低能量最小值进行采样。

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