The low-frequency density of states for amorphous and crystalline ices

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DOIResolve DOI: http://doi.org/10.1007/s003390201688
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TypeArticle
Journal titleApplied Physics A: Materials Science & Processing
Volume74
Issue0
Pagess1185-s1187
AbstractIncoherent inelastic neutron scattering studies have been performed on two amorphous polymorphs and two crystalline polymorphs of ice, including high-density amorphous (hda) ice. Subsequent annealing cycles allowed data to be collected from low-density amorphous ice (lda), and crystalline ices Ic and Ih. Data were collected between 5 and 80 K for hda, and between 5 and 120 K for the other phases. The low-frequency (9<1 THz) densities of states of the four phases are compared. The data illustrate clearly an excess number of modes in the hda density of states at 5 K centered at 0.65 THz. The magnitude of the excess g(9) is considerably reduced upon heating the sample from 5 to 20 K. Above 60 K the density of states of hda was found to exhibit predominantly a Debye behavior, g(9)?A?, as 9? THz. No such excess modes were observed in lda or the two crystalline phases studied.
Publication date
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences; NRC Canadian Neutron Beam Centre
Peer reviewedNo
NPARC number12328355
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Record identifier13fe607b-ecd6-4d4c-84f2-53e1c09dd819
Record created2009-09-10
Record modified2016-05-09
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