Abstract
Optical absorption measurements on very pure CuCl single crystals, prepared by a novel process, show the exponential drop of the direct optical absorption edge to continue below an absorption coefficient $K\ensuremath{\sim}{10}^{\ensuremath{-}2}$ ${\mathrm{cm}}^{\ensuremath{-}1}$. This rules out unambiguously the existence of an indirect-gap absorption below 3 eV, which is not only consistent with band-structure calculations but also excludes pure CuCl from being a suitable candidate for intrinsic high-${T}_{c}$ superconductivity (on the grounds of existing theories).
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