Theoretical study of the low lying states of Al2As: Towards a reliable description

► The global minimum of Al2As belongs to the 2A′ state in the Cs structure. ► The 2A′ state correlates with the 2B2 state in the C2v structure. ► The stable minimum is found both for the 2A1 and 2B1 states. ► The Hartree-Fock instability occurs around the 2B2 state equilibrium. ► The photodetachments to the 2B2, 2A1, and 2B1 states can be observed.