Water dynamics at the nanoscale
The recent construction of an Inelastic UltraViolet Scattering (IUVS) beamline at the ELETTRA Synchrotron Light Laboratory opens new possibilities for studying the density fluctuation spectrum, S(Q,E), of disordered systems in the mesoscopic momentum (Q) and energy (E) transfer region not accessib...
Збережено в:
Дата: | 2008 |
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Автори: | , , |
Формат: | Стаття |
Мова: | English |
Опубліковано: |
Інститут фізики конденсованих систем НАН України
2008
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Назва видання: | Condensed Matter Physics |
Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/118993 |
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Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
Цитувати: | Water dynamics at the nanoscale / C. Masciovecchio, F. Bencivenga, A. Gessini // Condensed Matter Physics. — 2008. — Т. 11, № 1(53). — С. 47-56. — Бібліогр.: 28 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of UkraineРезюме: | The recent construction of an Inelastic UltraViolet Scattering (IUVS) beamline at the ELETTRA Synchrotron
Light Laboratory opens new possibilities for studying the density fluctuation spectrum, S(Q,E), of disordered
systems in the mesoscopic momentum (Q) and energy (E) transfer region not accessible by other spectroscopic
techniques. As an example of possible application of IUVS technique we will discuss the new insights
provided in the case of water dynamics. From the analysis of IUVS spectra we were able to measure the temperature
and pressure dependencies of structural relaxation time (τ) in water. In the case of room-pressure
water the values of τ, as derived by IUVS, are fairly consistent with previous determinations and, most important,
its temperature dependence agrees with Mode Coupling Theory (MCT) predictions. Moreover we found
that τ decreases with increasing pressure at fixed temperature. The observed trend demonstrates that the
structural relaxation phenomenology is strongly affected by the applied pressure. However, further investigations
are necessary in order to clarify the physical meaning of these preliminary experimental results. |
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