  An argon-xenon (Ar/Xe) plasma is used as a model system for complex plasmas.
Based on this system, symmetric low-pressure capacitively coupled
radio-frequency discharges are examined utilizing Particle-In-Cell/Monte Carlo
Collisions (PIC/MCC) simulations. In addition to the simulation, an analytical
energy balance model fed with the simulation data is applied to analyze the
findings further. This work focuses on investigating the ion dynamics in a
plasma with two ion species and a gas mixture as background. By varying the gas
composition and driving voltage of the single-frequency discharge, fundamental
mechanics of the discharge, such as the evolution of the plasma density and the
energy dispersion, are discussed. Thereby, close attention is paid to these
measures' influence on the ion energy distribution functions at the electrode
surfaces. The results show that both the gas composition and the driving
voltage can significantly impact the ion dynamics. The mixing ratio of argon to
xenon allows for shifting the distribution function for one ion species from
collisionless to collision dominated. The mixing ratio serves as a control
parameter for the ion flux and the impingement energy of ions at the surfaces.
Additionally, a synergy effect between the ionization of argon and the
ionization of xenon is found and discussed.
