Volume 8 provides an exhaustive source of information on elastic scattering, momentum transfer and viscosity cross-sections for collisions of hydrogenic ions, atoms and molecules, and their isotopes, in the energy range pertinent to fusion reactor divertor plasma and extending (in its low-energy part) to collision conditions that are relevant for astrophysics. Hydrogen ion-helium atom collisions are also included in this volume. The reported cross-sections are obtained from extensive quantum-mechanical calculations and can be regarded as having very high accuracy. Contents: Part A: Introduction and theory; Part B: Ion-neutral collision systems; Part C: Neutral-neutral collision systems.