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Gas-phase and Ar-Matrix SQM scaling factors for various DFT functionals with basis sets including polarization and diffuse functions

机译:各种DFT功能的气相和Ar-Matrix SQM比例因子,其基本集包括极化和扩散功能

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摘要

Scaling factors for Pulays scaled quantum mechanical (SQM) scheme have been determined for four different widely used DFT functionals (PBE, B3LYP, B3PW91, and M06-2X) and for two basis sets (6-31++G* and aug-cc-pVTZ) by fitting computed results to 347 fundamental experimental vibrational frequencies of 33 molecules. Measurements in the gas phase and in solid argon matrices were used independently in the fitting procedure in order to provide a simple method of estimating matrix shifts. The accuracy of the new scaling factors is demonstrated on test molecules including hydrogen-bonded systems and molecules containing chlorine and sulfur atoms.
机译:已针对四种广泛使用的DFT功能(PBE,B3LYP,B3PW91和M06-2X)以及两个基础集(6-31 ++ G *和aug-cc)确定了Pulays比例量子力学(SQM)方案的比例因子-pVTZ),将计算结果拟合到33个分子的347个基本实验振动频率。在拟合过程中,气相和固体氩气基质中的测量独立使用,以便提供估算矩阵位移的简单方法。在包括氢键体系和含氯和硫原子的分子在内的测试分子上证明了新比例因子的准确性。

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