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动态电子相关性和化学键. 三,第三部分. 在A₂分子中的共价键 (A=C-F)

Thom H Dunning¹, Lu T Xu¹

¹Department of Chemistry, University of Washington, Seattle, Washington 98195, USA. thdjr@uw.edu.

Physical chemistry chemical physics : PCCP

|September 20, 2024

概括

这项研究调查了同核二原子分子 (A2) 中的动态电子相关性. 研究人员发现C2-O2的相关性能量具有令人费解的最小值,影响光谱常量.

科学领域:

计算化学的计算化学
量子化学是一个量子化学.
分子光谱学分子光谱学

背景情况:

旋转合的通用价值键 (SCGVB) 波函数捕获非动态电子相关性.
动态电子相关性仍然是预测分子性质的关键因素.
之前的研究研究了AH和AF分子的动态相关性.

研究的目的:

将动态电子相关性的分析扩展到同核二原子分子 (A2,其中A=C-F).
调查动态相关能量 (ΔE_DEC(R)) 作为核间距离 (R) 的函数的行为.
分析动态相关性对A2分子的光谱常数的影响.

主要方法:

使用了自旋合的通用价值键 (SCGVB) 波函数计算.
计算了A2分子 (A = C-F) 的潜在能量曲线和相关能量 (ΔE_DEC(R)).
检查了SCGVB波函数的N2在DE_DEC的最小值附近.

主要成果:

对于A2分子来说,在很远的距离上,ΔE_DEC (R) 随着R的减少而几乎呈指数增长.
对于C2-O2,随着R的进一步下降,观察到 ΔE_DEC (R) 的最小值.
动态相关性能量的这一最小值的原因尚不清楚.
在平衡距离 (Re) 周围的 ΔE_DEC (R) 的变化不均地影响光谱常数.

结论:

动态电子相关性在同核二原子分子中表现出复杂的行为.
相关性能量的观察到的最小值是一个需要进一步研究的难题.
了解这些相关性效应对于准确预测分子性质和光谱常数至关重要.

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