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Few-femtosecond electron transfer dynamics in photoionized donor–π–acceptor molecules
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Few-femtosecond electron transfer dynamics in photoionized donor–π–acceptor molecules
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Journal Article
Few-femtosecond electron transfer dynamics in photoionized donor–π–acceptor molecules
2024
Overview
The exposure of molecules to attosecond extreme-ultraviolet (XUV) pulses offers a unique opportunity to study the early stages of coupled electron–nuclear dynamics in which the role played by the different degrees of freedom is beyond standard chemical intuition. We investigate, both experimentally and theoretically, the first steps of charge-transfer processes initiated by prompt ionization in prototype donor–
π
–acceptor molecules, namely nitroanilines. Time-resolved measurement of this process is performed by combining attosecond XUV-pump/few-femtosecond infrared-probe spectroscopy with advanced many-body quantum chemistry calculations. We show that a concerted nuclear and electronic motion drives electron transfer from the donor group on a sub-10-fs timescale. This is followed by a sub-30-fs relaxation process due to the probing of the continuously spreading nuclear wave packet in the excited electronic states of the molecular cation. These findings shed light on the role played by electron–nuclear coupling in donor–
π
–acceptor systems in response to photoionization.
The first steps of charge transfer in molecules after their interaction with light occur on an ultrafast timescale. Now, by combining attosecond pump/few-femtosecond probe spectroscopy with quantum chemistry calculations, it has been shown that a concerted nuclear and electronic motion drives electron transfer in donor–
π
–acceptor molecules on a sub-10-fs timescale.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
