Spectra of the Manganese-Like Ions from Y XV to Ag XXIII

The 3p-3d transitions of the manganese-like ions Y¹⁴⁺, Zr¹⁵⁺, Nb¹⁶⁺, Mo¹⁷⁺, Ru²⁰⁺, Rh²¹⁺ and Ag²²⁺ have been studied in low inductance vacuum sparks. Isoelectronic regularities and theoretical calculations of wavelengths and line strengths supported the classification of 272 lines. The interpretation of 43 levels of 3d ⁷ and 98 levels of 3p ⁵3d ⁸ by means of the Slater-Condon theory led to fitted energy parameters in generalized least-squares procedures involving the 8 elements. Magnetic M1 dipole transitions within the ground configuration 3d ⁷ are predicted for diagnostics in low density plasmas.