Interpretation of angle-resolved x-ray photoemission spectra

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Abstract
This paper presents several new considerations concerning angle-resolved x-ray photoemission. Phononassisted processes are explicitly considered; it is found that even when such processes dominate direct transitions, agreement between theoretical predictions and experiment is obtained only if the final states are treated as Bloch-like and highly mixed. The use of augmented-plane-wave final states and a proper statistical treatment of the x-ray photon field is outlined for copper and found to yield nearly quantitative agreement with experimental results. The relationship between this and older plane-wave model calculations is discussed in detail, as is the physical significance of the new results.