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arXiv 1806.08951physics.chem-ph
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单分子Stokes位移动力学:构象和环境的影响

Dynamics of Single Molecule Stokes Shifts: Influence of Conformation and Environment

Martin Streiter, Stefan Krause, Christian von Borczyskowski, Carsten Deibel

摘要:

本文报道了单分子斯托克斯位移随时间变化的测量。利用宽带激发和发射光谱研究了嵌在聚合物基体中的单分子二酰亚胺(PDI)在秒尺度上的斯托克斯位移随时间的演化。斯托克斯位移在单个分子之间以及经历不同构象和几何形状的单个分子之间变化。从斯托克斯位移的分布和时间演化,我们揭示了纳米环境和分子构象的相互作用。我们发现,斯托克斯位移波动有关的同时和单向移动的发射和激发光谱。

英文摘要:

We report on time dependent Stokes shift measurements of single molecules. Broadband excitation and emission spectroscopy were applied to study the temporal Stokes shift evolution of single perylene diimide molecules (PDI) embedded in a polymer matrix on the time scale of seconds. The Stokes shift varied between individual molecules as well as for single molecules undergoing different conformations and geometries. From the distribution and temporal evolution of Stokes shifts, we unravel the interplay of nano-environment and molecular conformation. We found that Stokes shift fluctuations are related to simultaneous and unidirectional shifts of both emission and excitation spectra.

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