Abstract
In this chapter we commence our discussion of multichannel R-matrix theory by considering its application in the study of low-energy electron collisions with atoms and atomic ions. As well as describing an important application of the theory, this chapter provides an introduction to the basic concepts of multichannel R-matrix theory which will be applied in later chapters to a wide range of other atomic, molecular and optical collision processes. We restrict our consideration in this chapter to low-energy electron collisions, where only elastic scattering and excitation processes are energetically allowed or play a significant role in the collision process. We consider electron collisions with atoms and atomic ions at intermediate energies, which range from close to the ionization threshold to several times this threshold, in Chap. 6.
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