PRIMARY PROCESSES IN RADIATION DAMAGEColor center formation in KBr under polarized UV-laser irradiation
Domain: Physics
A definite [1[MATH]0]-dichroism is found in the absorption band of H centers produced under two-photon excitation of KBr by using [110]-polarized KrF-excimer laser light (λ = 248.5 nm). Anisotropy is also confirmed in the π emission from the lowest triplet level of the self-trapped exciton (STE), its polarization being parallel to the [110] direction. Origin of these anisotropy is discussed in terms of the anisotropic excitation of STE from its lowest triplet level to higher hole-excited state. In other words, presence of one-photon process is also important in this case. Some of the excited STE's with the [110]-orientation relax to branch into a channel to F-H pair production, which results in the [1[MATH]0]-polarized H absorption.
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A definite [1[MATH]0]-dichroism is found in the absorption band of H centers produced under two-photon excitation of KBr by using [110]-polarized KrF-excimer laser light (λ = 248.5 nm). Anisotropy is also confirmed in the π emission from the lowest triplet level of the self-trapped exciton (STE), its polarization being parallel to the [110] direction. Origin of these anisotropy is discussed in terms of the anisotropic excitation of STE from its lowest triplet level to higher hole-excited state. In other words, presence of one-photon process is also important in this case. Some of the excited STE's with the [110]-orientation relax to branch into a channel to F-H pair production, which results in the [1[MATH]0]-polarized H absorption.
Article published online by
EDP Sciences
and available at
http://dx.doi.org/10.1051/jphyscol:1980676
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Publié le :
29/06/2012
Langue :
Français
Nombre de pages :
4
Type de la publication :
Rapports et thèses
Thème :
Savoirs >
Science de la nature
Source :
Journal de Physique Colloques
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