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Optical dynamics of condensed molecular aggregates: An accumulated photon-echo and hole-burning study of the J-aggregate

✍ Scribed by Steven de Boer; Kees J. Vink; Douwe A. Wiersma

Publisher: Elsevier Science
Year: 1987
Tongue: English
Weight: 787 KB
Volume: 137
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(87)80312-3

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✦ Synopsis

Accumulated photon-echo and hole-burning experiments on the well-known J-bands of pseudoisocyanine bromide in an aqueous ethylene glycol glass are reported. From the low-temperature photon-echo decay of z 14 ps and the assumption that this lifetime is purely radiative, the mean number of molecules in the aggregates is calculated to be about 500. It is shown that the temperatureactivated optical dynamics of the excitonic J-bands can best be explained by invoking the presence of a pseudo-localized degree of freedom of = 9 cm-'. It is concluded that photoionization is the primary process that causes hole burning of the J-bands and that the charge-separated state forms the bottleneck in the optical pumping cycle.

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