Fig. 7
From: Reactivity of He with ionic compounds under high pressure
Orbital occupations of Ca-3d and Li-2p orbitals in A-B and A-BHe compounds. a The d orbital occupation of Ca ions in both CaF2 and CaF2He. b The p orbital occupation of Li ions in both Li2O and Li2OHe. Li1 and Li2 represent Li atoms at two inequivalent sites in the crystal
