Highly ionized members of the Pm sequence should produce strong resonance lines in the uv spectra of hot plasmas contaminated by heavy elements. These ions for $Z>~74$ have an alkali structure with ground configuration $4f^{14}5s$. Hartree-Fock calculations show that in ${\mathrm{W}}_{\mathrm{XIV}}$ through Uxxxii the dominant resonance lines are the $5s-5p$ doublets in the range $\lambda =100-400\mathrm{}$ Å. Approximate predictions are given for the doublet wavelengths, line strengths, and mean lives.

• Received 23 July 1980

DOI:https://doi.org/10.1103/PhysRevLett.45.2099