The dielectric relaxation of water between 0°C and 35°C
The dielectric relaxation of water between 0°C and 35°C
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DOI：
10.1016/s0009-2614(99)00455-8
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发表时间：
1999-06-04
影响因子：
2.8
通讯作者：
Stauber, J
中科院分区：
文献类型：
--
作者：
Buchner, R;Barthel, J;Stauber, J
我们实验室在温度0.2小于或等于v/摄氏度小于或等于35的纯水的精确复介电常数数据与文献结果相结合，以覆盖0.2小于或等于v/GHz小于或等于410的频率范围。(v)光谱的描述需要两个德拜过程的叠加。尽管如此，弛豫时间和色散振幅阻碍了用双态模型讨论水结构。用弛豫时间tau(2)解释快速过程需要额外的信息，而将占主导地位的慢过程的弛豫时间tau(1)与可移动水分子的产生速率联系起来是可能的。由相应的Eyring自由能δ G（不相等）推导出氢键概率，与其他方法的数据吻合较好。(C) 1999 Elsevier Science B.V.版权所有
precise complex permittivity data from our laboratory for pure water at temperatures 0.2 less than or equal to v/degrees C less than or equal to 35 are combined with literature results to cover the frequency range 0.2 less than or equal to v/GHz less than or equal to 410. A description of the (v) spectra requires the superposition of two Debye processes. Nonetheless, relaxation times and dispersion amplitudes discourage the discussion of the water structure in terms of a two-state model. The interpretation of the fast process with the relaxation time tau(2) requires additional information, whereas it is possible to relate the relaxation time tau(1) of the dominating slow process to the production rate of mobile water molecules. From the corresponding Eyring free energy, Delta G(not equal), hydrogen-bond probabilities are deduced, which are in good agreement with data from other methods. (C) 1999 Elsevier Science B.V. All rights reserved.