Linewidths In Spectra Of Terrylene In Polyethylene Probed By Incoherent Photon Echo. Comparison With Single Molecule Spectroscopy Data

N. Gruzdev, R. I. Personov, Y. Vainer
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Abstract

The concept of the homogeneous spectral linewidth of an impurity center is more complicated in disordered media such as organic glasses and polymers than it is in crystals. In amorphous media the local environments for impurity centers are continuously changing with time. As a result transition frequencies of individual centers diffuse within the inhomogeneous broadened spectral contour, which is called spectral diffusion. When the timescale for spectral diffusion processes is much longer than the dephasing time, it is possible to distinguish homogeneous dephasing from spectral diffusion. On the other hand, when the timescales of spectral diffusion and dephasing processes are comparable these phenomena become indistinguishable.
用非相干光子回波探测聚乙烯中涤纶的光谱线宽。与单分子光谱数据的比较
杂质中心均匀谱线宽度的概念在无序介质如有机玻璃和聚合物中比在晶体中更为复杂。在非晶介质中,杂质中心的局部环境随时间不断变化。结果,单个中心的跃迁频率在非均匀的加宽光谱轮廓内扩散,称为光谱扩散。当光谱扩散过程的时间尺度远大于脱相时间时,可以区分均匀脱相和光谱扩散。另一方面,当光谱扩散和消相过程的时间尺度相当时,这些现象变得难以区分。
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