  The charge and proton dynamics in hydrogen-bonded networks are investigated
using ammonia as a model system. The fragmentation dynamics of medium-sized
clusters (1-2 nm) upon single photon multi-ionization is studied, by analyzing
the momenta of small ionic fragments. The observed fragmentation pattern of the
doubly- and triply- charged clusters reveals a spatial anisotropy of emission
between fragments (back-to-back). Protonated fragments exhibit a distinct
kinematic correlation, indicating a delay between ionization and fragmentation
(fission). The different kinematics observed for channels containing protonated
and unprotonated species provides possible insights into the prime mechanisms
of charge and proton transfer, as well as proton hopping, in such a nanoscale
system.
