Photoelectron spectra of Al5Om(m=35) 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.

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