Experimental observation of the liquid-liquid transition in bulk supercooled water under pressure

doi:10.1126/science.abb9385

GSTDTAP > 气候变化

DOI	10.1126/science.abb9385
	Experimental observation of the liquid-liquid transition in bulk supercooled water under pressure
	Kyung Hwan Kim; Katrin Amann-Winkel; Nicolas Giovambattista; Alexander Späh; Fivos Perakis; Harshad Pathak; Marjorie Ladd Parada; Cheolhee Yang; Daniel Mariedahl; Tobias Eklund; Thomas. J. Lane; Seonju You; Sangmin Jeong; Matthew Weston; Jae Hyuk Lee; Intae Eom; Minseok Kim; Jaeku Park; Sae Hwan Chun; Peter H. Poole; Anders Nilsson
	2020-11-20
发表期刊	Science
出版年	2020
英文摘要	Theoretical simulations suggest that deeply supercooled water undergoes a transition between high- and low-density forms, but this transition is difficult to study experimentally because it occurs under conditions in which ice crystallization is extremely rapid. Kim et al. combined x-ray lasers for rapid structure determination with infrared femtosecond pulses for rapid heating of amorphous ice layers formed at about 200 kelvin. The heating process created high-density liquid water at increased pressures. As the layer expanded and decompressed, low-density liquid domains appeared and grew on time scales between 20 nanoseconds and 3 microseconds, which was much faster than competing ice crystallization. Science , this issue p. [978][1] We prepared bulk samples of supercooled liquid water under pressure by isochoric heating of high-density amorphous ice to temperatures of 205 ± 10 kelvin, using an infrared femtosecond laser. Because the sample density is preserved during the ultrafast heating, we could estimate an initial internal pressure of 2.5 to 3.5 kilobar in the high-density liquid phase. After heating, the sample expanded rapidly, and we captured the resulting decompression process with femtosecond x-ray laser pulses at different pump-probe delay times. A discontinuous structural change occurred in which low-density liquid domains appeared and grew on time scales between 20 nanoseconds to 3 microseconds, whereas crystallization occurs on time scales of 3 to 50 microseconds. The dynamics of the two processes being separated by more than one order of magnitude provides support for a liquid-liquid transition in bulk supercooled water. [1]: /lookup/doi/10.1126/science.abb9385
领域	气候变化 ; 资源环境
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引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/304407
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Kyung Hwan Kim,Katrin Amann-Winkel,Nicolas Giovambattista,et al. Experimental observation of the liquid-liquid transition in bulk supercooled water under pressure[J]. Science,2020.
APA	Kyung Hwan Kim.,Katrin Amann-Winkel.,Nicolas Giovambattista.,Alexander Späh.,Fivos Perakis.,...&Anders Nilsson.(2020).Experimental observation of the liquid-liquid transition in bulk supercooled water under pressure.Science.
MLA	Kyung Hwan Kim,et al."Experimental observation of the liquid-liquid transition in bulk supercooled water under pressure".Science (2020).