Volume 9 of Atomic and Plasma–Material Interaction Data for Fusion is devoted to a review of the role of atomic, molecular and plasma–wall interaction processes in divertor plasmas of magnetic fusion devices. The present volume is intended to provide fusion reactor designers with a detailed survey of existing, critically assessed data for the behaviour of plasma-facing materials under particle impact. This volume of Atomic and Plasma–Material Interaction Data for Fusion is the result of a three year Co-ordinated Research Project on "Atomic and plasma-wall interaction data for fusion reactor divertor modelling" in the period 1998–2000. Contents: 17 review and original research articles on atomic and plasma–wall interaction topics in divertor plasma modelling.