Electron binding energies and Dyson orbitals of $Al5Om−$ $(m=3,4,5)$ and $Al5O5H2−$

Photoelectron spectra of $Al5Om−$ $(m=3–5)$ and of the anion produced by the dissociative adsorption of a water molecule by $Al5O4−$ are interpreted with density-functional geometry optimizations and electron-propagator calculations of vertical electron detachment energies. For $Al5O3−$⁠, $Al5O4−$⁠, and $Al5O5H2−$⁠, the observed signals may be attributed to the most stable isomer of each anion. For $Al5O5−$⁠, the features in the photoelectron spectrum are due to three almost isoenergetic isomers.