On the photographic plates of the C${\mathrm{O}}_2$ spectrum made by S. Mrozowski from the 30-foot, 30,000 lines per inch, Chicago grating, were found pictures of the first negative bands and the comet tail bands of C${\mathrm{O}}^{+}$ in which the ${}_{}{}^2{}_{}{}^{}\Sigma$ spin splittings were resolved. From the ${}_{}{}^2{}_{}{}^{}\Sigma \to {}_{}{}^2{}_{}{}^{}\Sigma$ transition, the absolute differences of the spin doubling coefficients were measured. The absolute values of ${{\gamma }_0}^{\prime \prime }$ and ${{\gamma }_1}^{\prime \prime }$ for the lowest ${}_{}{}^2{}_{}{}^{}\Sigma$ state were measured from the ${}_{}{}^2{}_{}{}^{}\Pi \to {}_{}{}^2{}_{}{}^{}\Sigma$ transition, and their algebraic signs determined by consideration of relative intensities of branches. Thus the signs and values of the spin doubling coefficients of ${}_{}{}^2{}_{}{}^{}\Sigma _{}^{\prime }{}_{}{}^{}$ for $v^{\prime }=0\mathrm{} \mathrm{to} 4$, and of ${}_{}{}^2{}_{}{}^{}\Sigma _{}^{\prime \prime }{}_{}{}^{}$ for $v^{\prime \prime }=0\mathrm{} \mathrm{to} 7$ have been determined.

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