The copper deuteride bands have been photographed with high dispersion and an analysis is given of the ${}_{}{}^1{}_{}{}^{}\Sigma _{}^{*}{}_{}{}^{}-{}_{}{}^1{}_{}{}^{}\Sigma$ system. The ${\mathrm{Cu}}^{63}$D and ${\mathrm{Cu}}^{65}$D isotopic bands are separated and an independent analysis is given for each. From data obtained for the normal ${}_{}{}^1{}_{}{}^{}\Sigma$ state, $\rho$ for ${\mathrm{Cu}}^{65}$D to ${\mathrm{Cu}}^{63}$D is 0.999503 which agrees with the best mass spectrographic data. A comparison with Heimer and Heimer's CuH analysis gives a value of $\rho$ equal to 0.7131 for ${\mathrm{Cu}}^{63}$D to ${\mathrm{Cu}}^{63}$H. The electronic isotope displacement of CuD relative to CuH is 19 ${\mathrm{cm}}^{-1\mathrm{}}$.

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