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The photodissociation of mass-selected benzene cluster ions,(    C  6    H  6    )    n  +(   n  =  2  −  8   )    , is studied to elucidate the dynamics of dissociation and the mechanism of fragmentation. For(    C  6    H  6    )    2  +    , the average translational energy and the angular distributions of the photofragments are measured as a function of photon energy (hv). The photoexcitation to an upper bound state with hv = 2.81 eV results in statistical energy disposal. Regardless of the excitation to a dissociative state with hv = 1.17-1.62 eV, only a small fraction (at most 10%) of the available energy is partitioned into the translation. For(    C  6    H  6    )    n  +with n = 5-8, the average number of neutral molecules ejected following photoexcitation increases linearly with increasing hv until(    C  6    H  6    )    2  +is reached as the product. The result suggests that the photofragmentation proceeds via the sequential evaporation of neutral monomers rather than the direct ejection of a neutral cluster.

Photodissociation Mechanisms of Benzene Cluster Ions on the Excitation With hv = 0.5-3.0 eV