Abstract
R-matrix theory has been the basis of computer programs that have described a wide range of atomic, molecular, optical and surface processes for more than twenty-five years1. These processes now include electron scattering by atoms, ions and molecules, atomic and molecular photoionization, free-free transitions, atomic and molecular multiphoton processes, positron scattering by atoms and molecules, electron scattering by molecules physisorbed on surfaces and electron energy loss in transition metal oxides. The R-matrix programs written to describe these processes have been used to calculate data of importance in many applications including those in laser physics, controlled thermonuclear fusion and plasma physics, atmospheric physics and chemistry and astronomy2. These programs are now used world-wide and have formed the basis of several international collaborations including most notably the international Opacity Project3.
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