Author： Erguig H.
Publisher： Taylor & Francis Ltd
ISSN： 0038-7010
Source： Spectroscopy Letters, Vol.41, Iss.7, 2008-10, pp. : 337-343
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Abstract
We have calculated the stress-induced variations in refractive indices (of the index of refraction Δn and of the extinction coefficient Δk) of CuCl by the means of the Kramers-Kronig relationship from the piezoreflectance spectra of the 1s Z3 and 1s Z12 excitons. In the two studied configurations corresponding with the applied stress p//[001] and p//[111] the spectrum of the differential parameters Δk consist of two principals absorption lines in the region of the Z3 band. The corresponding energetic separation is comparable with the transverse-longitudinal splitting. The longitudinal Z3 exciton Γ5L is mixed with the transverse exciten Γ5T by virtue of the stress-induced k-linear term and became optically active.
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