Fig. 2

Kinematics and velocity analysis of CO₂⁺ scattering on Au. a Experimental exit energies of CO₂⁺, O₂⁺, O₂⁻, CO⁺, CO⁻, and O⁻ ions from CO₂/Au collisions as a function of CO₂⁺ incidence energy. All points represent the peak of the respective energy distribution obtained from Gaussian fitting of the experimental data. All solid lines represent one-parameter linear fittings with BCT-derived slopes. No fittings are shown for O₂⁺ and CO⁺ data because of overlap with their negative ion counterparts. b Experimental velocity distributions of select scattered product ions for E₀ = 56.4 ± 2.5 eV. c Calculated exit energies of CO₂⁺, O₂⁺, O₂⁻, CO⁺, CO⁻, and O⁻ ions from MD simulations of CO₂/Au collisions as a function of CO₂⁺ incidence energy; slopes and intercepts listed in the inset are two-parameter best-fittings. The error bars represent one standard deviation across 10 samples of 2000 trajectories each from the ensemble of molecular dynamics trajectories. d Calculated velocity distributions from MD simulations for select scattered ion products at E₀ = 56.4 eV. Vertical dashed lines in (b) and (d) indicate alignment with respect to the CO₂⁺ (dashed black line) and O₂⁻ (dashed blue line) peaks