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Spectral diffusion in organic glasses. Temperature dependence of permanent and transient holes

✍ Scribed by R. Wannemacher; J.M.A. Koedijk; S. Völker

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
786 KB
Volume
206
Category
Article
ISSN
0009-2614

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✦ Synopsis

Spectral diffusion of the S, tSo O-O transition (a) of bacteriochlorophyll a (BChl a) as guest in the glasses ethanol (EtOH), triethylamine (TEA), 2-methyltetrahydrofuran (MTHF) and diethylether at low temperature has been studied by transient and permanent hole burning with a single-mode GaAlAs diode laser at = 780 nm. Transient holes decay on a time scale of about 100 ms, determined by the triplet-state lifetime of BChl a. Their widths are compared to those of permanent holes probed on a time ' 3*0.' scale of minutes; both follow a T temperature dependence between 1.2 and 4.2 K and extrapolate to the fluorescence lifetime-limited value for T+O. The amount of spectral diffusion, derived from the difference in width of permanent and transient holes over a time span between z lo-$ and 2: IO2 s, strongly depends on the glassy host.

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