Abstract
We report on the stability and the processes occurring in clusters of nucleobases and amino acids after multi-ionization upon collisions with highly charged ions. The observed appearance sizes, which are compared with different systems, are found to be slightly lower for amino acids than for nucleobases. As shown by quantum chemical calculations, performed for the doubly-charged α-alanine decamer, this may be partly explained by a rearrangement of the molecules within the cluster, which increases the distance between the charges, thus, reducing the Coulomb repulsion. Hot clusters are stabilized by the emission of neutral monomers occurring, as demonstrated for cytosine clusters, with high intensity on the μs time scale, in particular for clusters of high charge states. This is consistent with a higher energy transfer in the multi-ionization process.
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