Abstract
We have measured the normal reflection spectrum of (110) cleaved faces of single crystals of CuCl in the spectral range of the Z 3 and Z 12 exciton lines at the temperature of 95 K. We have fitted the experimental data by computing a non local dielectric function and taking into account various additional boundary conditions (ABC) and the dead layer model in a semi-infinite crystal. A quantitative agreement is obtained assuming the following values of the effective masses of the excitons: M(Z 3) = 2.4 m 0 , M(Z 12) = 0.65 m 0 . These results do not depend on the choice of a particular auxiliary boundary condition.
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