Multidimensional spectroscopy of photoreactivity
Multidimensional spectroscopy of photoreactivity
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光反应性多维光谱
DOI:
10.1073/pnas.1323792111
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
T. Brixner
中科院分区:
文献类型:
--
作者:
S. Ruetzel;M. Diekmann;P. Nuernberger;C. Walter;B. Engels;T. Brixner
Coherent multidimensional electronic spectroscopy is commonly used to investigate photophysical phenomena such as light harvesting in photosynthesis in which the system returns back to its ground state after energy transfer. By contrast, we introduce multidimensional spectroscopy to study ultrafast photochemical processes in which the investigated molecule changes permanently. Exemplarily, the emergence in 2D and 3D spectra of a cross-peak between reactant and product reveals thecis–transphotoisomerization of merocyanine isomers. These compounds have applications in organic photovoltaics and optical data storage. Cross-peak oscillations originate from a vibrational wave packet in the electronically excited state of the photoproduct. This concept isolates the isomerization dynamics along different vibrational coordinates assigned by quantum-chemical calculations, and is applicable to determine chemical dynamics in complex photoreactive networks.
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