Porosity and crystallization of water ice films studied by positron and positronium annihilation

被引：24

作者：

Wu, Y. C. ^{[1
,2
]}

Jiang, J. ^{[1
]}

Wang, S. J. ^{[1
]}

Kallis, A. ^{[2
]}

Coleman, P. G. ^{[2
]}

机构：

[1] Wuhan Univ, Sch Phys & Technol, Hubei Nucl Solid Phys Key Lab, Wuhan 430072, Peoples R China

[2] Univ Bath, Dept Phys, Bath BA2 7AY, Avon, England

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 06期

基金：

中国国家自然科学基金;

关键词：

AMORPHOUS SOLID WATER; DIELECTRIC-CONSTANT FILMS; VARIABLE-ENERGY POSITRONS; THIN-FILMS; KINETICS; DESORPTION; DIFFUSION; MORPHOLOGY;

D O I：

10.1103/PhysRevB.84.064123

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The growth, evolution, and annealing of closed and interconnected pores in amorphous and crystalline films of water ice grown under a range of conditions have been studied by variable-energy positron annihilation spectroscopy (VEPAS). By measuring positron and positronium-related annihilation parameters as a function of time and film temperature it is shown that VEPAS has the capacity to yield a wealth of depth-dependent information on film morphology, with particularly promising results on the evolution and annealing of subnanometer closed pores-inaccessible to other techniques-and the study of the energetics of structural and phase changes.

引用

页数：6

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