This volume deals with specific fields of atomic physics: photoionization, photoelectron spectroscopy and the Auger effect. Here a vast amount of experimental and theoretical results has emerged during the last two decades, indeed in the case of photoelectron spectroscopy the field itself has been developed only since the mid-fifties. Experimentally, this was mostly due to the development of high resolution electron spectrometers and the availability or the development of new radiation sources (e. g. synchrotron radiation, reso- nance radiation of rare gas discharge lamps, monochromatized...