Electron Capture into Different ($n, l$) States in Slow Collisions of ${\mathrm{C}}^{6+}$, ${\mathrm{N}}^{6+}$, ${\mathrm{O}}^{6+}$, and ${\mathrm{Ne}}^{6+}$ Projectiles on He and ${\mathrm{H}}_2$ Targets

Absolute cross sections for electron capture into different $\mathrm{nl}$ states for ${\mathrm{C}}^{6+}$, ${\mathrm{N}}^{6+}$, ${\mathrm{O}}^{6+}$, ${\mathrm{Ne}}^{6+}$-He and ${\mathrm{N}}^{6+}$, ${\mathrm{O}}^{6+}$-${\mathrm{H}}_2$ collisions in the 0.15-0.5 a.u. velocity range have been measured. These cross sections strongly depend on the collision velocity, in contrast with the total capture cross sections and the cross sections for capture into different $n$ states. Similarities in ${\sigma }_{\mathrm{nl}}\mathrm{}\left(v\right)\mathrm{}$ dependences for different ions with the same ionic charge are found which are attributed to the hydrogenlike structure of the energy levels of these ions.