CALCULATION OF PHOTOIONIZATION CROSS-SECTION - AN OVERVIEW

The electron emission is one of the most efficient decay mechanisms for atoms or molecules excited above the ionization threshold. This makes the knowledge of reliable photoionization cross sections very valuable in a variety of fields. Their importance has grown also for the development of the laser sources and of the synchrotron radiation which have greatly extended both the range of photon energies and the number of photons involved in the processes.