Modes Due to Clusters of Impurities in Alkali Halide Crystals

Asian Resonance(P: ISSN No. 0976-8602 RNI No.UPENG/2012/42622 VOL.-V, ISSUE-I, January-2016 E: ISSN No. 2349-9443)   

Abstract


 S. S. Khatri 

Associate Professor, Deptt. of Physics, North-Eastern Hill University, Shillong

When impurities are doped in otherwise pure crystals in large concentrations, the probability of cluster formation of impurities becomes quite appreciable. Formation of pairs, triplet cluster and higher order clusters takes place. Mutual interaction between these impurities gives rise to localized modes. Such modes have been observed in various systems. In poly atomic impurities such modes have been observed as side bands of the internal vibrations.

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http://www.socialresearchfoundation.com/upoadreserchpapers/1/92/1603191018531st%20s.s.%20khatri.pdf


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