用量子力学方法通过振动和光电子光谱对S2O和S2O-进行表征
Chunlei Teng1,2, Siting Hou2,3, Changjian Xie2,3
1School of Physics, Northwest University, Xi'an 710127, China.
The journal of physical chemistry. A
|December 3, 2025
概括
这项研究准确地建模了S2O分子及其离子,揭示了小型同位素效应和光电子光谱中占主导地位的S-S拉伸模式,与实验数据相匹配.
科学领域:
- 计算化学计算化学
- 分子光谱学 分子光谱学
- 量子力学就是量子力学.
背景情况:
- 准确的潜在能量表面 (PES) 对于理解分子特性和光谱至关重要.
- 研究像S2O这样的硫氧化合物的电子和振动状态,可以了解化学键和反应性.
- 分子光谱中的同位素效应可以作为分子结构和振动动态的敏感探针.
研究的目的:
- 为中性S2O分子及其离子S2O-.构建精确的潜在能量表面 (PESs).
- 研究S2O和S2O-的振动光谱和S2O-的光电子光谱.
- 分析光电子光谱中涉及各种硫和氧同位素的同位素效应.
主要方法:
- 使用了高级明确相关联的合集群方法 (CCSD(T) -F12) 和内部合约的多引用配置交互 (MRCI-F12+Q).
- 为了准确的电子结构计算,使用了一个大型基础集 (cc-pCVQZ-F12).
- 神经网络被用来表示潜在能量表面,使得对光谱和同位素效应的严格量子力学计算成为可能.
主要成果:
- 计算的同位素比和32S216O-的光电子光谱与实验数据有很好的一致性.
- 发现光电子光谱中的同位素效应很小,峰值位置和强度的变化很小.
- 光电频谱主要由S-S拉伸振动模式 (v3) 支配,并联模式的贡献较弱.
结论:
- 开发的PES和计算方法准确地复制了S2O和S2O-的实验光谱数据.
- 该研究强调了S-S拉伸模式在S2O-的电离过程中占据主导地位.
- 在光电子光谱中观察到的模式特异性与正常坐标移位的理论预测相一致.
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