3s–3p, 3p–3d, and 3d–4f transitions of sodiumlike ions

Abstract

New measurements have been made for wavelengths of the 3s–3p, 3p–3d, and 3d–4f transitions of the sodiumlike ions Cu¹⁸⁺, Zn¹⁹⁺, Ga²⁰⁺, Ge²¹⁺, As²²⁺, Se²³⁺, Br²⁴⁺, Kr²⁵⁺, Y²⁸⁺, Zr²⁹⁺, Nb³⁰⁺, Mo³¹⁺, Ru³³⁺, Rh³⁴⁺, Pd³⁵⁺, Ag³⁶⁺, and Sn³⁹⁺. The measurements were made by photographing laser-produced plasmas and tokamak plasmas with grazing-incidence spectrographs. The energies of the transitions were also calculated with Dirac–Fock computer codes. By fitting the differences between the observed and calculated wave numbers to simple formulas, least-squares-fitted wavelengths for all sodiumlike ions from Ar⁷⁺ to Xe⁴³⁺ were determined. The estimated uncertainty of the fitted wavelengths is ±0.007 Å, which makes them useful as reference values. The wavelengths range from 9 to 713 Å.