Linked Life Data

15245129

Source:http://linkedlifedata.com/resource/pubmed/id/15245129

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
24
pubmed:dateCreated
2004-7-12
pubmed:abstractText
The dynamic structure factor of vitreous silica and glycerol has been measured as a function of temperature and of the momentum transfer up to Q=0.105 nm(-1) using a novel experimental technique, the inelastic ultraviolet scattering. As in the case of Brillouin light scattering and ultrasonic measurements, the temperature dependence of the acoustic attenuation shows a plateau below the glass transition whose amplitude scales as Q2. Moreover, a slight temperature dependence of attenuation has been found in vitreous silica at about 130 K, which seems to be reminiscent of the peak measured at lower Qs. These two findings strongly support the idea that anharmonicity is responsible for sound attenuation at ultrasonic and hypersonic frequencies. Finally, we demonstrate that the attenuation mechanism should show a change of regime between 0.105 and 1 nm(-1).
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Jun
pubmed:issn
0031-9007
pubmed:author
pubmed:issnType
Print
pubmed:day
18
pubmed:volume
92
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
247401
pubmed:year
2004
pubmed:articleTitle
Inelastic ultraviolet scattering from high frequency acoustic modes in glasses.
pubmed:affiliation
Sincrotrone Trieste, Area Science Park, 34012 Basovizza Trieste, Italy.
pubmed:publicationType
Journal Article