Influence of the liquid helium meniscus on neutron reflectometry data
Neutron reflectometry offers a unique opportunity for the direct observation of nanostratification in ³He–⁴He mixtures in the ultra-low temperature limit. Unfortunately the results of recent experiments could not be wellmodelled on account of a seemingly anomalous variation of reflectivity with mo...
Збережено в:
| Дата: | 2016 |
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| Автори: | , , , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2016
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| Назва видання: | Физика низких температур |
| Теми: | |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/128468 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Influence of the liquid helium meniscus on neutron reflectometry data / C.J. Kinane, O. Kirichek, T.R. Charlton,P.V.E. McClintock // Физика низких температур. — 2016. — Т. 42, № 2. — С. 202–206. — Бібліогр.: 24 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | Neutron reflectometry offers a unique opportunity for the direct observation of nanostratification in ³He–⁴He
mixtures in the ultra-low temperature limit. Unfortunately the results of recent experiments could not be wellmodelled
on account of a seemingly anomalous variation of reflectivity with momentum transfer. We now hypothesize
that this effect is attributable to an optical distortion caused by the liquid’s meniscus near the container
wall. The validity of this idea is tested and confirmed through a subsidiary experiment on a D₂O sample, showing
that the meniscus can significantly distort results if the beam size in the horizontal plane is comparable with,
or bigger than, the diameter of the container. The meniscus problem can be eliminated if the beam size is substantially
smaller than the diameter of the container, such that reflection takes place only from the flat region of
the liquid surface thus excluding the meniscus tails. Practical measures for minimizing the meniscus distortion
effect are discussed. |
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