在轨道表面跳动动力学模拟中选择哪种电子结构方法? 亚甲作为一个案例研究
Thomas V Papineau1, Denis Jacquemin1,2, Morgane Vacher1
1Nantes Université, CNRS, CEISAM UMR 6230, Nantes F-44000, France.
The journal of physical chemistry letters
|January 11, 2024
概括
准确的潜在能量表面对于光化学反应的非adiabatic动态模拟至关重要. 多引用方法是首选的,但具有混合功能和ADC的TD-DFT提供了高效的替代方案,尽管它们可能会高估衰变产量.
科学领域:
- 计算化学的计算化学
- 摄影化学的使用.
- 电子结构理论 电子结构理论
背景情况:
- 非相应动力学模拟对于研究光化学反应至关重要.
- 准确的潜在能量表面和合是必不可少的,但很少被评估.
- 选择电子结构方法显著影响模拟可靠性.
研究的目的:
- 为了对各种后哈特里-福克方法和TD-DFT函数进行非adiabatic动态的基准测试.
- 评估它们在复制放松路径和时间尺度方面的表现.
- 为光化学反应研究确定可靠和高效的计算方法.
主要方法:
- 轨迹表面跳跃动力学模拟.
- 高精度XMS-CASPT2电子结构计算作为一个基准.
- 用PBE,PBE0和CAM-B3LYP函数对CIS,ADC(2),CC2,CASSCF和TD-DFT/TDA进行评估.
- 试验案例:在双键周围的异体化.
主要成果:
- 建议使用多参考电子结构方法来研究非亚性衰变.
- 具有TDA和混合功能的TD-DFT,以及ADC(2),是高效的替代方案.
- 这些替代方案可能会高估非辐射衰变产量,可能缺失消兴途径.
结论:
- 电子结构方法的准确性对于可靠的非adiabatic动力学模拟至关重要.
- 虽然多参考方法提供了最高的准确性,但存在一些具有一定局限性的经济有效的替代方案.
- 需要仔细选择计算方法,以准确捕捉光化学反应动态.
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