Crystalline and amorphous structure of astrophysical ices
The structure of water and other ices strongly depends on the temperature at which they formed, e.g., by vapor deposition. It is amorphous if ices are formed at low temperature (e.g., 10–30 K for water ice), or crystalline if the deposition temperature is higher (140–150 K). Ices have a “polycryst...
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| Published in: | Физика низких температур |
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| Date: | 2013 |
| Main Author: | |
| Format: | Article |
| Language: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2013
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| Subjects: | |
| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/118455 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Crystalline and amorphous structure of astrophysical ices / G. Strazzulla // Физика низких температур. — 2013. — Т. 39, № 5. — С. 556–559. — Бібліогр.: 26 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Summary: | The structure of water and other ices strongly depends on the temperature at which they formed, e.g., by vapor
deposition. It is amorphous if ices are formed at low temperature (e.g., 10–30 K for water ice), or crystalline
if the deposition temperature is higher (140–150 K). Ices have a “polycrystalline” structure at intermediate temperatures.
The crystalline structure of ices can be damaged up to a complete amorphization by processes such as
those due to energetic ion bombardment. Here I describe some experimental results obtained by ion irradiation of
water and ammonia ices, two species particularly relevant in astrophysics. The results are discussed in the light
of the relevance they have in astronomical environments where the actual structure of the ices depends on a
competition between energetic processing that induce amorphization and thermal annealing that favors the transition
towards more ordered structures.
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| ISSN: | 0132-6414 |