Far-infrared properties of two-level systems in amorphous ice
Laboratory of Atomic and Solid State Physics and the Center for Radiophysics
Research, Cornell University - Ithaca, NY 14853-2501, USA
Accepted: 27 October 2000
Isotopic substitution and defect doping have been used to alter the optical properties of two-level systems (TLS) in the two amorphous phases of a- ice. A large TLS optical density of states is found for a- and a-HOD in the high-density amorphous phase while a thirty times smaller value occurs for both in the low-density amorphous one. Our quantitative spectroscopic and thermal study bring out a number of new features, among them that LiCl doping of low-density amorphous ice increases its TLS optical density of states, its glass transition temperature and its fragility.
PACS: 63.50.+x – Vibrational states in disordered systems / 78.30.Ly – Disordered solids / 78.90.+t – Other topics in optical properties, condensed matter spectroscopy and other interactions of particles and radiation with condensed matter
© EDP Sciences, 2001