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 3d7 and 98 levels of 3p53d8 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 3d7 are predicted for diagnostics in low density plasmas.

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