醇的非转动极化机制
Non-rotational mechanism of polarization in alcohols
摘要：
化学极性决定了碳纳米管的各种机械、化学和热力学性质。极性液体已被充分研究，但其介电性质的基本机制仍然没有完全理解，因为遵循德拜唯象方法的标准模型没有考虑量子效应，并且不能适当地再现整个直流到太赫兹的光谱范围。在这里，使用说明性的情况下，一元醇，我们表明，深隧穿和随之而来的分子间分离的过量质子和“质子空穴”在极性液体管理他们的静态和动态的介电性能相同的立足点。我们进行了系统的超宽带（0-10 THz）光谱实验与不同（0.4-1.6 nm）分子长度的一元醇，并表明，有限的分子物种的寿命，和质子空穴相关长度是两个主要参数负责所有研究的醇在整个频率范围内的介电响应。我们的研究结果表明，量子非旋转分子间机制驱动的极化在醇类中，而分子极化的旋转机制起着次要的作用，只表现在亚太赫兹区域。
英文摘要：
Chemical polarity governs various mechanical, chemical and thermodynamic properties of dielectrics. Polar liquids have been amply studied, yet the basic mechanisms underpinning their dielectric properties remain not fully understood, as standard models following Debye's phenomenological approach do not account for quantum effects and cannot aptly reproduce the full dc-up-to-THz spectral range. Here, using the illustrative case of monohydric alcohols, we show that deep tunneling and the consequent intermolecular separation of excess protons and "proton-holes" in the polar liquids govern their static and dynamic dielectric properties on the same footing. We performed systematic ultrabroadband (0-10 THz) spectroscopy experiments with monohydric alcohols of different (0.4-1.6 nm) molecular lengths, and show that the finite lifetime of molecular species, and the proton-hole correlation length are the two principle parameters responsible for the dielectric response of all the studied alcohols across the entire frequency range. Our results demonstrate that a quantum non-rotational intermolecular mechanism drives the polarization in alcohols while the rotational mechanism of molecular polarization plays a secondary role, manifesting itself in the sub-terahertz region only.
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