Structural relaxations in amorphous water studied by hole-burning spectroscopy

✍ Scribed by T. Giering; D. Haarer

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 716 KB
• Volume: 261
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(96)01004-4

✦ Synopsis

The annealing behavior of dye-doped amorphous water below its glass transition temperature was investigated by means of spectral hole-burning and IR spectroscopy. The dye molecules act, at low concentration, as optical probes of the water matrix. Measurements of the time-resolved spectral diffusion of spectral holes confirm that the narrowing of the quasi-homogeneous linewidth observed upon annealing is due to a reduction of the number density of two-level systems. Further information is gained from temperature cycling experiments. The results strongly indicate a transformation from a fragile to a strong glass by the formation of an H-bond network.