Electronic structure and muonic x-ray intensities in isoelectronic series of neon and argon

We report on muonic Lyman-series x-ray intensities measured in gaseous argon and in ${\mathrm{K}}^{+}$, ${\mathrm{Cl}}^{\mathrm{-}}$, ${\mathrm{Na}}^{+}$, and ${\mathrm{F}}^{\mathrm{-}}$ in the compounds KF and NaCl. The analysis of their structures, including neon, shows that both the spatial symmetry and the binding energy of the electrons of outer shells determine the angular momentum distribution of captured muons. The conclusions are in agreement with the modified model of ‘‘large mesic molecules.’’