电场诱导的不连续性的发生和影响,来自局部化的对-自然-轨道方法的相关能量
Jose P Madriaga1, T Daniel Crawford1
1Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States.
电场效应的局部对-自然-轨道合集群单双 (LPNO-CCSD) 计算中的不连续性可能会导致预测分子性质的重大错误. 这些错误被数值分化方法放大,影响着极化性和超极化性预测.
科学领域:
- 计算化学是一种计算化学.
- 量子化学是一种量子化学.
- 理论化学是一种理论化学.
背景情况:
- 外部电场影响分子电子结构和性质.
- 局部对-自然-轨道合集群单双 (LPNO-CCSD) 是用于相关电子结构计算的高效方法.
- 在化学和材料科学中,准确预测电场依赖性质至关重要.
研究的目的:
- 在外部静电场下的LPNO-CCSD方法中调查相关性能量中断.
- 分析这些不连续性对更高阶电场依赖性质的影响.
- 识别计算预测中错误的原因.
主要方法:
- 采用了局部对-自然-轨道合集群单双 (LPNO-CCSD) 方法.
- 使用的小分子试验案例包括水,乙烯,低酸和cis-1,3-butadiene.
- 计算了电场依赖性质,并分析了相关能量的不连续性.
主要成果:
- 观察到一些小的不连续性 (约. 由于虚拟轨道领域的场诱导变化导致的相关能量的1μEh).
- 证明这些不连续性导致通过有限差异方法计算的更高阶特性存在实质性错误 (对于水的静态超极化率超过100%).
- 发现弱场位移和具有扩散函数的基数集会加剧这些错误,即使在PNO切线很紧.
结论:
- 在电场下LPNO-CCSD能量计算中的不连续性对准确预测分子响应属性构成重大挑战.
- 有限差异技术放大了这些不连续性,导致极化性和超极化性的戏剧性错误.
- 需要进一步的方法开发来减轻这些错误,以便可靠的计算预测.
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