Dipartimento di Fisica, Università degli Studi di Perugia, Via Pascoli, 06123 Perugia, Italy.
J Chem Phys. 2009 Oct 21;131(15):154507. doi: 10.1063/1.3223537.
We measured the dynamic structure factor of the liquid and glassy phases of the LiCl-6H(2)O solution by means of inelastic scattering of radiation in the visible, UV, and x-ray range, between 1 GHz and 10 THz, and by means of photon-correlation spectroscopy, between 0.01 Hz and 20 kHz. The measurements were performed in the temperature range between 353 and 80 K. Our data show that a single-relaxation process exists at high temperature, which has features similar to those of the single relaxation of pure water. Upon cooling the system below approximately 220 K, this single mode starts to differentiate two processes, a structural (alpha-) and a secondary (beta-) relaxation. As the temperature is decreased, the beta-relaxation is the vanishing continuation of the single, high-temperature process, while the onset of the alpha-relaxation occurs at the expense of the beta-process.
我们通过在可见、紫外和 X 射线范围内的辐射非弹性散射（频率在 1GHz 到 10THz 之间），以及通过光子相关光谱学（频率在 0.01Hz 到 20kHz 之间），测量了 LiCl-6H2O 溶液的液态和玻璃态的动态结构因子。测量是在 353 到 80K 的温度范围内进行的。我们的数据表明，在高温下存在一个单松弛过程，它具有类似于纯水的单松弛的特征。当系统冷却到大约 220K 以下时，这个单模开始分化成两个过程，一个是结构（α-）松弛，另一个是次级（β-）松弛。随着温度的降低，β-松弛是单高温过程的消失延续，而α-松弛的开始则是以β-过程为代价的。
