Low-energy neutron vibrational spectra of high pressure phases of ice

Article type: Research Article

Authors: Kolesnikov, A.I. | Li, J.C. | Colognesi, D.

Affiliations: IPNS, Argonne National Laboratory, Argonne, Illinois, IL 60439, USA | Department of Physics, The University of Manchester, Manchester M60 1QD, UK | Consiglio Nazionale delle Ricerche, Istituto di Fisica Applicata ‘Nello Carrara’, via Madonna del Piano, 50019 Sesto Fiorentino, FI, Italy

Note: [] Corresponding author. Tel.: + 44-0161-200-3933. Fax: + 44-0161-200-3941. Email: [email protected]

Abstract: An extra intensity was observed in inelastic neutron scattering spectra at low energy transfers for vapour-deposited amorphous ice and high-density amorphous (hda) ice compared to their crystalline analogues, hexagonal ice-Ih and high-pressure phase ice-VI, respectively. These low-energy excitations (LEE) in the deposited amorphous ice can be mainly described as a Boson peak. The origin of the LEE for the hda ice is not clear; it can be either due to the Boson peak or can originate from a softening of sound waves.

Keywords: Ice, Neutron spectrosopy, Boson scattering, Inelastic neutron scattering

DOI: 10.1080/10238160601048940

Journal: Journal of Neutron Research, vol. 14, no. 4, pp. 325-331, 2006