The book provides an introduction to the Green-Function (GF) theory of chemisorption. It is self-contained and requires only a basic knowledge of quantum mechanics and solid-state physics. The GF approach lends itself well to the pedagogically desirable modellistic treatment of the subject. Throughout each chapter, step-by-step details are provided by which the calculations are performed, so that readers are led from the simple to the more advanced aspects, in a straightforward manner. In this way, students gain confidence to read the current literature on their own.§This book includes:§- A straightforward introduction into Green-Function Theory of Chemisorption§- The mathematical foundation of the Green Function Method§- Electron- electron interaction on the adatom§- Demonstration of the power and versatility of the technique §- Metalized semiconductor substrates as example of supported catalysts§- Electronic properties of disordered binary alloys and treatment of chemisorption on such substrates§- Chemisorption on electrified substrates§- Implications of two atoms interacting with a substrate on adatom formation§- Extensive Appendices