Angle Resolved Photoemission Spectroscopy on High Temperature Superconductors : Studies of Bi2212 and Single Layer FeSe Film Grown on SrTiO3 Substrate From the Contents: Brief introduction to cuprates and Fe based high Tc superconductors The discovery of high Tc superconductors Cuprates Fe based superconductors Introduction to angle resolved photoemission spectroscopy (ARPES) Energy resolution Momentum resolution (three step model) The physical processes in photoemission. This book mainly focuses on the study of the high temperature superconductor Bi2Sr2CaCu2O8+δ (Bi2212) and single layer FeSe film grown on SrTiO3 (STO) substrate by means of angle resolved photoemission spectroscopy (ARPES). It provides the first electronic evidence for the origin of the anomalous high temperature superconductivity in single layer FeSe grown on SrTiO3 substrate. Two coexisted sharp mode couplings have been identified in superconducting Bi2212. The first ARPES study on single layer FeSe STO films has provided key insights into the electronic origin of superconductivity in this system. A phase diagram and electronic indication of high Tc and insulator to superconductor crossover have been established in the single layer FeSe STO films. Readers will find essential information on the techniques used and interesting physical phenomena observed by ARPES.