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Electron-phonon relaxation in size-quantized systems may become inhibitedwhen the spacing of discrete electron energy levels exceeds the magnitude ofthe phonon frequency. We show, however, that nanoclusters can support a fastnonradiative relaxation channel which derives from their distinctive ability toundergo Jahn-Teller shape deformations. Such a deformation represents acollective and coherent vibrational excitation and enables electronictransitions to occur without a multiphonon bottleneck. We analyze thismechanism for a metal cluster within the analytical framework of athree-dimensional potential well undergoing a spheroidal distortion. Anexpression for the time evolution of the distortion parameter is derived, theelectronic level crossing condition formulated, and the probability ofelectronic transition at a level crossing is evaluated. An application toelectron-hole recombination in a closed-shell aluminum cluster with 40electrons shows that the short (~250 fs) excitation lifetime observed in recentpump-probe experiments can be explained by the proposed mechanism.Comment: 21 page

Fast electronic relaxation in metal nanoclusters via excitation of coherent shape deformations