Fundamental aspects of core level spectroscopies -- Many-body-charge-transfer effects in XPS and XAS -- Charge transfer multiplet theory -- X-ray photoemission spectroscopy -- X-ray absorption spectroscopy -- X-ray magnetic circular dichroism -- Resonant X-ray emission spectroscopy -- Precise derivation of XPS formula -- Fundamental tensor theory -- Derivation of the orbital moment sum rule -- Thereotical test of the spin sum rule -- Calculations of XAS spectra with single electron excitation models. "From fundamental aspects to recent developments. Core Level Spectroscopy of Solids presents the theoretical calculations, experimental data, and underlying physics of core level spectroscopies. This includes x-ray photoemission spectroscopy (XPS), x-ray absorption spectroscopy (XAS), x-ray magnetic circular dichroism (XMCD) and resonant x-ray emission spectroscopy (RXES). The book explains the many-body effects in XPS and XAS, where special attention is given to charge transfer, crystal field, and multiplet effects, Charge transfer multiplet theory combines these effects into a single theoretical approach that can be used to interpret XPS, XAS, and all other core level spectroscopies of systems, including transition metal and rare earth elements."--BOOK JACKET.