Mapping the Complete Reaction Path of a Complex Photochemical Reaction.

Mapping the Complete Reaction Path of a Complex Photochemical Reaction.
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绘制复杂光化学反应的完整反应路径。

DOI:
10.1103/physrevlett.120.183003
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发表时间:
2018
影响因子:
8.6
通讯作者:
Smith AD
Smith AD
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Smith AD

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We probe the dynamics of dissociatingmolecules across the entire reaction pathway upon excitation. Photoelectron spectroscopy measurements using laboratory-generated femtosecond extreme ultraviolet pulses monitor the competing dissociation, internal conversion, and intersystem crossing dynamics. Dissociation occurs either in the initially excited singlet manifold or, via intersystem crossing, in the triplet manifold. Both product channels are monitored and show that, despite being more rapid, the singlet dissociation is the minor product and that triplet state products dominate the final yield. We explain this by a consideration of accurate potential energy curves for both the singlet and triplet states. We propose that rapid internal conversion stabilizes the singlet population dynamically, allowing for singlet-triplet relaxation via intersystem crossing and the efficient formation of spin-forbidden dissociation products on longer timescales. The study demonstrates the importance of measuring the full reaction pathway for defining accurate reaction mechanisms.
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