在二原子分子中对二氧化和亚二氧化表达的数值等价性
Ryan P Brady1, Charlie Drury1, Sergei N Yurchenko1
1Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, U.K.
Journal of chemical theory and computation
|January 3, 2024
概括
这项研究从数值上证实了二元原子分子的Rovibronic计算的adiabatic和diabatic表示的等价性. 它强调了为准确的结果包括特定校正的重要性,无论所选择的表示方式如何.
科学领域:
- 量子化学 是一个量子化学.
- 分子光谱学 分子光谱学
- 计算物理 计算物理
背景情况:
- 施罗丁格方程是使用附带电位能量曲线 (PECs) 和近似方法来解决的.
- 对于相互作用的电子状态至关重要的非adiabatic 效应,通过衍生合 (DDR) 或非adiabatic 合 (NAC) 进行管理.
- 二氧化分子在亚性PEC中表现出避免的交叉,而亚性表示通过最小化DDR提供了替代方案.
研究的目的:
- 为了数值地证明二元原子分子的亚亚巴特和糖尿病的罗维布朗计算之间的等价性.
- 使用ab initio数据验证两个表示的准确性.
- 调查特定校正和表示选择对计算趋同的影响.
主要方法:
- 解决原子系统的时间独立的施罗丁格方程.
- 使用亚亚巴特电位能量曲线 (PEC) 和衍生合 (DDR).
- 在变异性Rovibronic代码Duo中实现一个新的糖尿病模块用于计算.
主要成果:
- 首次证明了阿迪亚巴特和糖尿病罗维布朗计算之间的数值等价性.
- 使用氧化 (YO) 和一氧化碳 (CH) 的计算证实了同等性,分别展示了具有强大的NAC和糖尿病合的系统.
- 确定了包括对角波恩-奥本海默校正和非诊断性DDRs的重要性.
结论:
- 对于二元原子分子的罗维布罗尼克计算,adiabatic和diabatic的表示都是数值相当的.
- 准确的计算需要包括对角波恩-奥本海默校正和非诊断的DDR.
- 振动能计算的趋同取决于表示,这表明没有一种方法是普遍最佳的.
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