Observations of the growth and sublimation of water ice films by variable-energy positron annihilation spectroscopy

16th International Conference on Positron Annihilation

Townrow, S.^1 ; Coleman, P.G.^1 ; Wu, Y.C.^2 ; Jiang, J.^2 ; Wang, S.J.^2

Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom^1

School of Physics and Technology, Hubei Nuclear Solid Physics Key Laboratory, Wuhan University, Wuhan 430072, China^2

关键词: Amorphous solid water films;    Highly dense;    Low porosity;    Lower temperatures;    Meso-pores;    Near surfaces;    Variable-energy positron annihilation spectroscopies;    Water-ice films;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012058/pdf
DOI  :  10.1088/1742-6596/443/1/012058

来源: IOP

【 摘 要 】

The near-surface structure of thin vapor-deposited water ice films during formation and sublimation in vacuum has been probed using in-situ positron annihilation spectroscopy. While amorphous solid water films prepared at 120K are highly dense with low porosity micro- and interconnected meso-pores have been observed in the top few tens of nm of ice films prepared at temperature of 170-180K as the films are forming and during sublimation. Responses to these near-surface pores are much more pronounced in films grown at 170-180K than in those grown at lower temperatures.