The author, S. Hüfner, presents an authoritative and up-to-date introduction to the field by comprehensively treating the electronic structures of atoms, molecules, solids, and surfaces. Brief descriptions are given of inverse photoemission, spin-polarized photoemission and photoelectron diffraction. Experimental aspects are considered throughout the third edition book and the results are carefully interpreted in terms of the theory. A wealth of measured data is presented in tabulator form for easy use by experimentalists. The reader will learn about the basic technique of photoemission spectroscopy and obtain the necessary background for work based on this book.