Theoretical description of photochemical hole burning in soft glasses

✍ Scribed by Bret Jackson; Robert Silbey

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 356 KB
• Volume: 99
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(83)87551-4

✦ Synopsis

The temperature dependence of the photochemical hole widths of molecules in soft glasses (T". u = 1.3-l-5) is esphiicd by a combination of two dephasing mechanisms_ The narrow distribution of two-level systems in such &zses gives rise to one contribution, and the dephasing of localized librational modes by long-wavelength phonons provides a second contribution. We show that in the range T G 25 K. the theoretical temperature dependence agrees with the experiment. Recently, there have been several articles devoted to the anomalous low-temperature impurity linewidths in glasses, as studied by hole burning and fluorescence line-narrowing techniques [l-l 2]_ The behavior is anomalous in that both the magnitude and temperature dependence differ significantly from that observed in similar crystalline hastes. The two-level syslem (TLS) model of Anderson et al. [ I] , and Phil-