...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Molecular inertial effects in liquids: Poley absorption, collision-induced absorption, low-frequency Raman spectrum and Boson peaks
【24h】

Molecular inertial effects in liquids: Poley absorption, collision-induced absorption, low-frequency Raman spectrum and Boson peaks

机译：液体中的分子惯性效应：Poley吸收，碰撞诱导吸收，低频拉曼光谱和玻色子峰

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The far-infrared absorption spectra of low-viscosity liquids contains a broad peak whose frequency decreases with increase in temperature and height increases. This is known as the Poley absorption. In the theory of itinerant oscillations of molecules in a liquid, the frequency of the Poley absorption peak is inversely proportional to the square root of a molecule's moment of inertia. Dipolar molecules confined to symmetrical cages in the structure of an ice clathrate crystal also show a peak in the far-infrared region. This has also been interpreted in terms of rotational oscillations of the dipolar molecule with its frequency being inversely proportional to the square root of the molecule's moment of inertia. The low-frequency Raman and the far-infrared absorption spectra (or the dielectric loss spectra in the THz frequency range) of a glass and a supercooled liquid also show a peak and several other features depending on the manner of presenting the Raman scattering and infrared absorption data. Data on these features are collected from the literature and compared here. It is shown that despite the differences arising from molecule-specific effects, these three features are remarkably similar, thus indicating that the vibrational effects attributed to the Boson peak and to other features of the low-frequency Raman scattering are likely to admit to the same underlying mechanisms as the Poley absorption. There is also a collision-induced absorption in liquids in the far-infrared region. Its equivalence in the Raman-scattering studies is yet to be recognized. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 132]
机译：低粘度液体的远红外吸收光谱包含一个宽峰，其频率随温度的升高而降低，高度随高度的升高而降低。这被称为Poley吸收。在液体中分子的反复振荡理论中，Poley吸收峰的频率与分子惯性矩的平方根成反比。限制在冰笼形晶体结构中的对称笼中的偶极分子在远红外区域也显示出一个峰。这也可以用偶极分子的旋转振荡来解释，其频率与分子惯性矩的平方根成反比。玻璃和过冷液体的低频拉曼光谱和远红外吸收光谱（或THz频率范围内的介电损耗光谱）也显示出一个峰值和一些其他特征，这取决于呈现拉曼散射和红外的方式吸收数据。这些特征的数据是从文献中收集并在此处进行比较的。结果表明，尽管由于分子特异效应而引起的差异，这三个特征非常相似，因此表明归因于玻色子峰和低频拉曼散射的其他特征的振动效应很可能被认为是相同的。潜在机理为Poley吸收。在远红外区域，液体中也有碰撞引起的吸收。它在拉曼散射研究中的等效性尚待确认。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：132]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号