Enhanced generation efficiency of high-energy multicharged ions under interaction of femtosecond relativistic laser pulses with mixed KrXe clusters

A new approach is proposed to the production of high-energy ions from a cluster jet irradiated with relativistic (5$\cdot$10$^{18}$ W/cm$^2$) femtosecond laser pulses, based on the formation of mixed clusters with an Xe core surrounded by a Kr shell. The appearance of distinguished charge states of accelerated ions was registered: instead of low-charge Kr$^{2+}$, Kr$^{3+}$, Kr$^{4+}$, Kr$^{5+}$ for pure Kr clusters, there are three components Kr$^{8+}$, Kr$^{14+}$, Kr$^{20+}$ for mixed KrXe clusters. The energy range of detected ions expands significantly: from 1–6 MeV for Kr clusters to 2–16 MeV for KrXe clusters.