Electronic structures of Al4As, Ga4As and their anions

Neutral M4As (M = Al, Ga) possess a C2v planar trapezoidal geometry. Their anions have a C4v square pyramidal geometry. The predicted adiabatic electron affinities of Al4As and Ga4As are 2.00 and 1.91 eV at the CCSD(T)//B3LYP/6-311+G(2d) level.