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Theoretical study of the photochemical generation of triplet acetophenone

机译:三重苯乙酮光化学生成的理论研究

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摘要

Acetophenone has a rich photochemistry, which strongly depends on the absorbing state. For example, the excitation to the lowest singlet excited state (S1) leads to a triplet population with a phosphorescence quantum yield of one, while the excitation to S2 leads to photocleavage reactions. Here, we rationalize the photochemistry of acetophenone after being absorbed into the S1, S2 and S3 states by performing a systematic study of all the singlet and triplet minimum energy structures and state crossings between the relevant electronic states. We calculate these structures at the complete-active space self-consistent field (CASSCF) level of theory and at the correlated extended second-order quasi-degenerate multi-reference perturbation theory (XMC_QDPT2), emphasizing the importance of correlation effects in the determination of structures.
机译:苯乙酮具有丰富的光化学性质,这在很大程度上取决于吸收状态。例如,激发到最低的单重态激发态(S1)导致三重态群体的磷光量子产率为1,而激发到S2则导致光解反应。在这里,我们通过对所有单重态和三重态最小能级结构以及相关电子态之间的态交叉进行系统研究,使苯乙酮被吸收到S1,S2和S3状态后的光化学合理化。我们在理论的完全活动空间自洽场(CASSCF)级别和相关的扩展二阶拟简简多参考微扰理论(XMC_QDPT2)上计算这些结构,强调了相关效应在确定噪声中的重要性。结构。

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