For the context of this book, the term “high energy spectroscopy” implies spectroscopies involving photons and/or electrons with energies between 10 eV and 10 keV. The advances made in recent years in these spectroscopies, and especially in their interpretation, provided one of the main motivations for this meeting. We felt that the last years had witnessed something of a breakthrough in the use of high energy spectroscopies to study narrow band materials. Even though such spectroscopies have poor resolution and cause a large perturbation, they have in some cases given surprisingly detailed insight into the ground state electronic properties. Here we give a very short historical overview of progress in high energy spectroscopies.
KeywordsPhotoelectron Spectrum Core Level Electron Wave Function Core Hole Ionization Energies21
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