The dispersed fluorescence spectra have been measured for the 7AI-(H2O)(n) (n = 1-3) clusters in a supersonic free jet expansion by exciting various vibronic bands in the S, state. There has been controversy about the occurrence of the excited-state proton transfer in the n = 2,3 clusters. The absence of visible fluorescence from the tautomer forms of 7AI-(H2O)(n) (n = 1-3) indicates that the full tautomerization due to photoinduced excited-state proton transfer does not occur during the lifetime of the S, state of the normal form each cluster. © 2005 Elsevier B.V. All rights reserved.