PSEUDOLOCAL PHONONS IN PARA-TERPHENYL - PENTACENE SINGLE-CRYSTALS
PSEUDOLOCAL PHONONS IN PARA-TERPHENYL - PENTACENE SINGLE-CRYSTALS
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DOI：
10.1063/1.463161
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发表时间：
1992-08-01
影响因子：
4.4
通讯作者：
KUPKA, H
中科院分区：
文献类型：
--
作者：
FLEISCHHAUER, HC;KRYSCHI, C;KUPKA, H
使用位点选择性光谱研究了 4.2 K 下对三联苯晶体中并五苯客体的荧光和激发光谱中声子边带的结构性质。 观察到声子边带结构的独特特征显着取决于占据三斜对三联苯晶格中四个不等价位点的并五苯的客体位点构型。 假定主导声子边带结构的尖峰是由赝局域声子产生的。 计算赝局域声子的特征值和特征向量，对不同的并五苯位点配置进行修正的正常模式分析，包括所有分子间原子对相互作用的贡献。
The structural nature of the phonon sidebands in the fluorescence and excitation spectra of pentacene guests in p-terphenyl crystals at 4.2 K are investigated using site-selective spectroscopy. The distinct features in the phonon sideband structure were observed to depend significantly on the guest site configuration of pentacene occupying four inequivalent sites in the triclinic p-terphenyl lattice. The sharp peaks dominating the phonon sideband structure are assumed to arise from the pseudolocal phonons. The eigenvalues and eigenvectors of the pseudolocal phonons are calculated carrying out a modified normal mode analysis on the distinct pentacene site configurations including the contribution of all intermolecular atom-pair interactions.