Argon $L$-shell ionization by 50- to 600-keV ${\mathrm{H}}^{+}$, ${\mathrm{D}}^{+}$, $\mathrm{H}_2^{}{}_{}{}^{+}$, and ${\mathrm{He}}^{+}$ impact

Production of Auger electrons from the Ar $L$ shell were studied in scattering experiments with 50- to 600-keV ${\mathrm{H}}^{+}$, ${\mathrm{D}}^{+}$, $\mathrm{H}_2^{}{}_{}{}^{+}$, and ${\mathrm{He}}^{+}$ impact on Ar. Electrons ejected at 150° with respect to the incident beam were measured using electrostatic parallel-plate spectrometers. Sets of electron spectra were acquired at different resolutions of 0.35-, 1.4-, and (1.7-2.4)-eV full width of half-maximum. Branching ratios for normal transitions from initial $L_2$ and $L_3$ vacancy states are compared with results of other authors. Satellite structures in the spectra are analyzed to determine probabilities for the excitation of multiple-vacancy states $L_{23}{M}^i$. Intensities of Auger electrons from the $L_1$ and $L_{23}$ shell are compared for an evaluation of the $L_1$-shell Coster-Kronig yield. Total cross sections for Ar $L$-shell ionization are obtained by integration of the Auger spectra and cross-section ratios are studied for ${\mathrm{He}}^{+}$ and ${\mathrm{D}}^{+}$ impact.