IR and singlecrystal Raman spectra of Te(OH), -2CO(NH,), were recorded and analysed. vibrational bands due to 0 -H bonds and TeO, and (NH,),CO groups are identified. From the spectra it is concluded that the TeO, groups occupy C, sites and the urea molecules vibrate independently in the crystal.
R6sum6-Des couches endommagdes par implantation ionique, 2 forte dose, dans GaAs ont 5tE reconstruites 2 l'aide d'un laser Ruby pulsS (nsec), d'un laser Nd-YAG puls6 (psec) ou d'un systsme de lampes 21 halogsne. La reconstruction du r6seau cristallin par ces diffSrentes techniques de recuit rapide est Stu-diEe par diffusion Raman des phonons.
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