Institut für Festkörperphysik, Technische Universität Darmstadt, Darmstadt, Germany.
Phys Chem Chem Phys. 2013 Jun 21;15(23):9308-14. doi: 10.1039/c3cp50818h. Epub 2013 May 10.
The postulated glass-liquid transition of low density amorphous ice (LDA) is investigated with deuteron NMR stimulated echo experiments. Such experiments give access to ultra-slow reorientations of water molecules on time scales expected for structural relaxation of glass formers close to the glass-liquid transition temperature. An involved data analysis is necessary to account for signal contributions originating from a gradual crystallization to cubic ice. Even if some ambiguities remain, our findings support the view that pressure amorphized LDA ices are of glassy nature and undergo a glass-liquid transition before crystallization.
用氘核 NMR 受激回波实验研究了低密度非晶冰（LDA）的假定玻璃-液体转变。这些实验可以探测到水分子在接近玻璃-液体转变温度的玻璃形成体结构弛豫时间尺度上的超慢重取向。需要进行复杂的数据分析，以解释源自逐渐结晶为立方冰的信号贡献。即使存在一些不确定性，但我们的发现支持这样一种观点，即加压非晶 LDA 冰具有玻璃态性质，并在结晶之前经历玻璃-液体转变。
