Cross sections for $K$-shell ionization of C${\mathrm{H}}_4$, ${\mathrm{N}}_2$, and Ne by 50- to 600-keV ${\mathrm{H}}^{+}$ and ${\mathrm{He}}^{+}$ impact

Absolute cross sections for $K$-shell ionization by 50- to 600-keV ${\mathrm{H}}^{+}$ and ${\mathrm{He}}^{+}$ incident on C${\mathrm{H}}_4$, ${\mathrm{N}}_2$, and Ne were measured by Auger-electron spectroscopy. Previous results obtained in our laboratory for C${\mathrm{H}}_4$ and ${\mathrm{N}}_2$ are compared with these new values which are measured with an improved apparatus. The projectile $Z$ dependence of the cross section was reanalyzed using the new data.