Abstract
The purpose of this article is to give a simple beginners introduction to the basic concepts of Multichannel Quantum Defect Theory (MQDT). This will be done by proceeding through a series of examples. Each example will add something to our understanding and will also illustrate an area in which the theory can be used. In particular MQDT is used to study Rydberg levels of atoms and molecules and the ionization continuum that lies above each Rydberg series. We will also see that MQDT can account for the interactions between the Rydberg series and continua that occur in an atom or a molecule. A short bibliography at the end includes references to several review articles to which interested readers are directed if they wish to deepen their knowledge.
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