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Publication
Physical Review Letters
Paper
Nondirect processes and optical properties of metals
Abstract
Recent photoemission studies of noble and transition metals show a predominance of "nondirect" electronic excitations and indicate an anomalous density-of-states peak below the expected d-band. We attribute these observations to second-order (and higher) processes involving secondary phonon- and electron-pair excitations. © 1967 The American Physical Society.