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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >High-Pressure Effects on the Electronic Structure of Anthracene Single Crystals: Role of Nonhydrostaticity
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High-Pressure Effects on the Electronic Structure of Anthracene Single Crystals: Role of Nonhydrostaticity

机译：蒽单晶电子结构的高压效应：非静水力的作用

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摘要

Optical spectroscopy methods were used to examine the effect of nonhydrostaticity on the electronic structure of anthracene single crystals compressed statically to 9 GPa. Two pressure-transmitting media, nitrogen (hydrostatic) and water (nonhydrostatic above similar to 5.5 GPa), were utilized. It was found that nonhydrostatic compression generates several new features both in the absorption and fluorescence spectra: (i) formation of new absorption and fluorescence bands, (ii) deviations in pressure shift of fluorescence peaks, (iii) extensive broadening of vibrational peaks, and (iv) irreversible changes in the spectra shape upon pressure unloading. Furthermore, the time-resolved fluorescence decay curves measured at the wavelength corresponding to the new fluorescence band show clear initial increase. These new features are accompanied by inhomogeneous color changes and macroscopic lines on the (001) plane of the crystal. All of the changes are discussed and correlated with microscopic transformations in the crystal. It is demonstrated that nonhydrostatic compression in anthracene crystal introduces inelastic changes in the form of dislocations along [110] and [1 (1) over bar0] directions. These dislocations lead to the development of dimeric structures and, consequently, to various changes in the electronic response of the compressed anthracene crystal.
机译：使用光谱学方法检查了非静水性对静态压缩至9 GPa的蒽单晶电子结构的影响。使用了两种压力传递介质，氮气（静水压力）和水（高于5.5 GPa的非静水压力）。发现非静压缩在吸收光谱和荧光光谱中都产生了几个新特征：（i）新的吸收光谱和荧光带的形成;（ii）荧光峰压力偏移的偏差;（iii）振动峰的广泛扩展;以及（iv）压力卸载时光谱形状的不可逆变化。此外，在对应于新荧光带的波长处测得的时间分辨荧光衰减曲线显示出明显的初始增加。这些新功能伴随着不均匀的颜色变化和晶体在（001）平面上的宏观线条。讨论了所有这些变化，并将它们与晶体中的微观转变相关联。结果表明，蒽晶体中的非静压压缩以位错的形式沿[110]和[1（1）在bar0]方向引入了非弹性变化。这些位错导致二聚体结构的发展，并因此导致压缩的蒽晶体的电子响应的各种变化。

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