The Boson peak in confined water: An experimental investigation of the liquid-liquid phase transition hypothesis

被引：0
作者：
Francesco Mallamace
Carmelo Corsaro
Domenico Mallamace
Zhe Wang
Sow-Hsin Chen
机构：
[1] Massachusetts Institute of Technology,Department of Nuclear Science and Engineering
[2] Università di Messina,Dipartimento di Fisica e Scienze della Terra
[3] Consiglio Nazionale delle Ricerche-IPCF Messina,Dipartimento di Scienze dell’Ambiente
[4] della Sicurezza,undefined
[5] del Territorio,undefined
[6] degli Alimentie,undefined
[7] e della Salute,undefined
来源：
Frontiers of Physics | 2015年 / 10卷
关键词：
supercooled water; liquid-liquid phase transition (LLPT); inelastic neutron scattering;
D O I：
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学科分类号：
摘要：
The Boson peak (BP) of deeply cooled confined water is studied by using inelastic neutron scattering (INS) in a large interval of the (P, T) phase plane. By taking into account the different behavior of such a collective vibrational mode in both strong and fragile glasses as well as in glass-forming materials, we were able to determine the Widom line that characterizes supercooled bulk water within the frame of the liquid-liquid phase transition (LLPT) hypothesis. The peak frequency and width of the BP correlated with the water polymorphism of the LLPT scenario, allowing us to distinguish the “low-density liquid” (LDL) and “high-density liquid” (HDL) phases in deeply cooled bulk water.Moreover, the BP properties afford a further confirmation of theWidom line temperature TW as the (P, T) locus in which the local structure of water transforms from a predominately LDL form to a predominately HDL form.
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