Many-body effects in interband resonances observed in photoemission from Pd(111)

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Abstract
The photoemission properties of Pd(111) have been studied in the photon energy range of 40-90 eV. In particular, the intensity profiles for constant initial energy (varying the photon energy) have been investigated. Full one-electron computations (of time-reversed low-energy electron diffraction type) were carried out using a self-consistent ground-state potential for the bulk. Although an overall, qualitative agreement was obtained, the inclusion of some many-body phenomena increased the agreement considerably: (i) lifetime broadening of the final electron state of the order of 8 eV, (ii) dynamic exchange-correlation shifts of the excited energy levels (approximately 4 eV), and (iii) a random-phase approximation type of correction of the excitation probability.