对于和基本频率 (和ZPVE) 的非实证双混合密度函数的精度和缩放因子
B Miguel1,2, E Brémond3, A J Pérez-Jiménez1
1Department of Physical Chemistry, University of Alicante, Alicante, Spain.
本研究提供了使用双混合密度函数的振动频率和零点振动能量 (ZPVE) 的缩放因子. PBE-QIDH功能为热化学计算和光谱分析提供了最佳的准确性.
科学领域:
- 计算化学的计算化学
- 量子化学 是一个量子化学.
- 理论化学 理论化学
背景情况:
- 精确计算分子振动频率和零点振动能量 (ZPVE) 对于预测热化学性质和理解振动频谱至关重要.
- 双混合密度函数 (DHDF) 为提高这些计算的准确性提供了一个有希望的方法.
研究的目的:
- 导出对和基本振动频率的缩放因子,以及ZPVE.
- 评估各种双混合密度函数的性能,包括旋转缩放和范围分离的变体.
- 评估基数大小对这些计算准确性的影响.
主要方法:
- 使用HFREQ2014数据集来确定参考值.
- 经过测试的PBE-QIDH,RSX-PBE-QIDH,SOS1-PBE-QIDH和SOS1-RSX-PBE-QIDH双混合动力密度函数. 这些函数可以使用
- 分析了 def-nVP(PD) 基数增长角动量集的结果.
主要成果:
- def2-TZVPD基础集显示了精度和计算成本之间的最佳平衡.
- (SOS1-) PBE-QIDH 函数的平均误差为频率低于 20 cm-1 ,ZPVE 的平均误差为 0.1 kcal/mol.
- PBE-QIDH 函数的表现优于它们的区间分离对应物 (RSX-PBE-QIDH).
结论:
- 导出的缩放因子和DHDF的评估可以显著提高热化学计算的准确性.
- 对于精确的振动频率和ZPVE预测,强烈建议使用 (SOS1-) PBE-QIDH双混合功能.
- 这些发现将有利于分析振动解析的光谱和相关的计算研究.
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