X-ray spectra of 2p-nd transitions with 4≤n≤18 in molybdenum (Z=42) charge states around neonlike (${\mathrm{Mo}}^{32+}$) have been observed from Alcator C-Mod plasmas. Accurate wavelengths (±0.1 mÅ) have been determined by comparison with neighboring argon and chlorine lines with well-known wavelengths. Line identifications have been made by comparison to ab initio atomic-structure calculations, using a fully relativistic, parametric-potential code, and agreement between measured and theoretical wavelengths is good. Calculated wavelengths and oscillator strengths are presented for the strongest transitions with upper levels n between 4 and 14 to the lower levels n=2 in the four charge states ${\mathrm{Mo}}^{30+}$–${\mathrm{Mo}}^{33+}$. Effects of configuration interaction have been observed in the intensities of lines with nearly degenerate energy levels.

• Received 9 January 1995

DOI:https://doi.org/10.1103/PhysRevA.51.3551