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Combining an electronic theory with molecular dynamics simulations we present results for the ultrafast structural changes in small clusters. We determine the time scale for the change from the linear to a triangular structure after the photodetachment process Ag_3^- → Ag_3. We show that the time-dependent change of the ionization potential reflects in detail the internal degrees of freedom, in particular coherent and incoherent motion, and that it is sensitive to the initial temperature. Wedoi:10.1103/physreva.54.r4601 pmid:9914127 fatcat:in3yxr2z6rdb5fuqjiq33bq3jm