Phys. Rev. Lett. 19, 222–224 (1967)Nondirect Processes and Optical Properties of MetalsReceived 3 May 1967; published in the issue dated 31 July 1967 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 URL:
http://link.aps.org/doi/10.1103/PhysRevLett.19.222
DOI:
10.1103/PhysRevLett.19.222
PACS:
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