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Relaxation and coherence of singlet-excitons in NaNO₂ crystals

Title data

Köhler, Jürgen ; Hucke, M. ; Schmid, D. ; Ashida, Masaaki ; Kato, Riso:
Relaxation and coherence of singlet-excitons in NaNO₂ crystals.
In: Journal of Luminescence. Vol. 53 (1992) Issue 1-6 . - pp. 76-79.
ISSN 0022-2313
DOI: https://doi.org/10.1016/0022-2313(92)90110-U

Abstract in another language

Dealing with intermolecular energy-transfer processes it is an interesting question whether the energy is transferred by a wave-like (coherent) or by a diffusion-like (incoherent) process. From former studies it was known that the first excited singlet state of NaNO2 can be described as a Frenkel-type exciton. Monitoring the fluorescence resulting from the decay of this exciton one observes that at 4 K thermal population within the exciton band is not established during the exciton lifetime of 8 ns. By the use of fluorescence line narrowing, where the detection of the signal is delayed with respect to the excitation, it was possible to obtain the temperature dependence of the thermalization process. Even at 11.5 K it takes 35 ns until the excitons populate the whole band. The interpretation of the data in terms of exciton k memory leads to the conclusion that between 11 and 15 K the nature of the energy transfer changes from coherent to incoherent.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: NaNO2
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie - Univ.-Prof. Dr. Jürgen Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie
Result of work at the UBT: No
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 12 Apr 2018 12:44
Last Modified: 16 Apr 2018 09:40
URI: https://eref.uni-bayreuth.de/id/eprint/43348