With three new chapters, revisions, updated material and numerous new additions and sections, this text encapsulates the fundamental quantum processes that are important to the physics and technology of semiconductors. The subject matter therefore focuses on electronic processes, and as with the first edition, the book restricts attention to bulk semiconductors. The theoretical level is at elementary first and second-order perturbation theory. The three new chapters discuss quantum processes in a magnetic field, scattering in a degenerate gas, and dynamic screening. Besides being a useful reference for workers in the field, this text will be valued for use in postgraduate courses.