Deep Terms in the Isoelectronic Sequence V I to Cu VII

By the use of constant second differences in the radiated frequencies from terms involving an electron transition to the ground state, it has been possible to identify the $3d^5{}_{}{}^6{}_{}{}^{}S_{\frac{5}{2}}^{}{}_{}{}^{}$ and $3d^{4}4p{}_{}{}^6{}_{}{}^{}P_{}^{\mathrm{o}}{}_{}{}^{}$ terms of this sequence. Ionization potentials cannot be computed because of the lack of completeness in the data on the first three members of the sequence.