The ground state geometry optimization followed by normal-mode analysis for both protonated species, 6-and 7-AIH + , was performed with Møller-Plesset perturbation theory to the second-order (MP2) with the aug-cc-pVDZ basis set. The excited states were calculated with the resolution-of-identity algebraic diagrammatic construction to the second-order (RI-ADC(2)) with the same basis set. The electronic structure calculations were carried out with Turbomole (version 7.3). The geometries of the intersections between the excited states S3/S2 and S2/S1 were located using the penalty function method implemented in the Conical Intersection Optimizer (CIOpt) program and adapted by us to work with Turbomole.