Institute of Physics and nanoMA (Center for nanostructured Materials and Analysis), Chemnitz University of Technology, 09107, Chemnitz, Germany.
Phys Chem Chem Phys. 2011 Feb 7;13(5):1754-61. doi: 10.1039/c0cp01713b. Epub 2010 Dec 8.
Heterogeneous line broadening and spectral diffusion of the fluorescence emission spectra of perylene diimide molecules have been investigated by means of time dependent single molecule spectroscopy. The influence of temperature and environment has been studied and reveals strong correlation to spectral diffusion processes. We followed the freezing of the molecular mobility of quasi free molecules on the surface upon temperature lowering and by embedding into a poly(methyl methacrylate) (PMMA) polymer. Thereby changes of optical transition energies as a result of both intramolecular changes of conformation and external induced dynamics by the surrounding polymer matrix could be observed. Simulations of spectral fluctuations within a two-level system (TLS) model showed good agreement with the experimental findings.
通过时间分辨单分子光谱学研究了苝二酰亚胺分子荧光发射光谱的非均匀线宽和光谱扩散。研究了温度和环境的影响，发现它们与光谱扩散过程有很强的相关性。我们通过降低温度和嵌入聚甲基丙烯酸甲酯（PMMA）聚合物来跟踪准自由分子在表面上的分子迁移率的冻结。由此可以观察到由于分子构象的分子内变化和周围聚合物基质引起的外部诱导动力学引起的光学跃迁能量的变化。在两能级系统（TLS）模型内对光谱波动的模拟与实验结果吻合较好。
