Ionization of water clusters by fast Highly Charged Ions: Stability, fragmentation, energetics and charge mobility
Journal of Physics: Conference Series(2009)
Abstract
We study dissociative ionization of water clusters by impact of fast Ni ions. Cold Target Recoil Ion Momentum Spectroscopy (COLTRIMS) is used to obtain information about stability, energetics and charge mobility of the ionized clusters. An unusual stability of the (H2O)4 H + ion is observed, which could be the signature of the so called Eigen structure in gas phase water clusters. High charge mobility, responsible for the formation of protonated water clusters that dominate the mass spectrum, is evidenced. These results are supported by CPMD and TDDFT simulations, which also reveal the mechanisms of such mobility.
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