Elementary processes with atoms and molecules in isolated and aggregated states

This topical issue on “Elementary processes with atoms and molecules in isolated and aggregated states” was motivated by the 6th Conference on Elementary Processes in Atomic Systems – CEPAS, which was held from July 9–12, 2014 in Bratislava, Slovakia. The conference program overlaps with the topic of this issue. The scientific papers in the topical issue cover the fields of electron, positron, ion and photon interactions with atoms, molecules and surfaces