Nonlinear optical response of endohedral all-metal electride cages 2e−Mg2+(M@E12)2−Ca2+(M = Ni, Pd, and Pt; E = Ge, Sn, and Pb)

The endohedral all-metal electride cages 2e⁻Mg²⁺(M@E₁₂)²⁻Ca²⁺(M = Ni, Pd, and Pt; E = Ge, Sn, and Pb) exhibit a better NLO response.