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Slow thermalization of singlet excitons in NaNO₂ crystals

Title data

Köhler, Jürgen ; Ashida, Masaaki ; Kato, Riso ; Schmidt, Th. ; Schmid, D.:
Slow thermalization of singlet excitons in NaNO₂ crystals.
In: Journal of Luminescence. Vol. 47 (1991) Issue 5 . - pp. 239-248.
ISSN 0022-2313
DOI: https://doi.org/10.1016/0022-2313(91)90016-O

Abstract in another language

We have investigated the luminescence of NaNO2 crystals and its dependence on the excitation conditions. Using a broad band light source the luminescence lines resulting from transitions into intramolecular vibrational states ('vibronic lines') are asymmetric. Comparing these line shapes for different states involved we conclude that the asymmetry is caused by the dispersion of the excitons and by that of the vibrational state of the electronic ground state. Exciting the crystal with a narrow band laser we observed at low temperatures a strong dependence of the fluorescence line shapes on the excitation energy. For temperatures above 15 K the 'broad band-excitation line shape' was observed independent of the excitation energy. This behaviour leads to the conclusion that in the case of selective excitation the exciton band is not populated uniformly due to the conservation of quasi-momentum and that the decay of excitons is faster than the thermalization within the exciton band at T = 4 K. At temperatures above T 15 K the thermalization is possibly accelerated by multi-phonon scattering processes and becomes the faster component.

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 11:03
Last Modified: 16 Apr 2018 09:40
URI: https://eref.uni-bayreuth.de/id/eprint/43340