High-resolution measurements of the photoinduced L and M x-ray spectra of metallic thorium and M x-ray spectrum of metallic uranium were performed with transmission-type and reflection-type bent-crystal spectrometers. Linewidths of $31L$ and $10M$ x-ray emission lines of thorium and of $12M$ x-ray emission lines of uranium were extracted. Using these results and those of Hoszowska et al. [Phys. Rev. A 50, 123 (1994)] for the L x rays of uranium, by means of a least-squares method we have determined the level widths of the subshells $L_1$ to $N_5$ of thorium and uranium.

• Received 23 July 1999

DOI:https://doi.org/10.1103/PhysRevA.61.012507