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Temperature Dependence of the Exciton Lineshape of GeO 2
Author(s) -
Fröhlich D.,
Weber H.J.,
Wille R.,
Francini R.
Publication year - 1984
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221260136
Subject(s) - exciton , phonon , raman spectroscopy , line width , asymmetry , laser , materials science , photon , coupling (piping) , line (geometry) , atomic physics , condensed matter physics , molecular physics , physics , optics , quantum mechanics , geometry , mathematics , metallurgy
Two‐photon measurements are presented of the IS exciton lineshape in GeO 2 between 4.5 and 150 K. With a frequency‐doubled dye laser and a Raman‐shifted Nd:YAG laser the excitonenergy around 4.65 eV can be scanned. The temperature dependence of the total line width can be explained by a theoretical model of exciton‐phonon coupling. Furthermore the results reveal an unexpected asymmetry, which seems to originate from a non‐uniform contribution of optical phonons.