This book describes important topics in high-temperature superconductivity; for graduate students and researchers.Despite a decade of research and tens of thousands of scientific papers on the subject, superconductivity in the cuprate ( high temperature ) superconductors is not yet understood. A good description of the behavior of electrons in these materials when in the normal and superconducting states has not yet been achieved. This book describes one of the most widely accepted techniques for studying the nature of the electrons in cuprates, photoelectron spectroscopy. The book is suitable for graduate students and researchers in physics, chemistry and materials science with an interest in high-temperature superconductivity.Despite a decade of research and tens of thousands of scientific papers on the subject, superconductivity in the cuprate ( high temperature ) superconductors is not yet understood. A good description of the behavior of electrons in these materials when in the normal and superconducting states has not yet been achieved. This book describes one of the most widely accepted techniques for studying the nature of the electrons in cuprates, photoelectron spectroscopy. The book is suitable for graduate students and researchers in physics, chemistry and materials science with an interest in high-temperature superconductivity.This book describes the current status and results of photoelectron spectroscopic techniques, both theoretical and experimental, that have been applied to the study of the cuprate ( high-temperature ) superconductors. The techniques described include angle-resolved photoelectron spectroscopy of valence electrons, core level spectra (XPS), and some special variations, such as resonance photoemission. Attention is paid to the difficulties in interpreting such spectra and to the problems obtaining good sample surfaces and high resolution, comparing results from other experimental techniques as well. The authors also outline l"