Observation of Strong Temperature Dependence and Direct-Transition Effects in Angle-Resolved X-Ray Photoelectron Spectra from the Valence Bands of Single-Crystal Tungsten
- 31 March 1980
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 44 (13) , 895-899
- https://doi.org/10.1103/physrevlett.44.895
Abstract
Strong temperature dependence has been observed in angle-resolved x-ray photoelectron spectra from the tungstem valence bands, indicating the importance of phonon-assisted nondirect transitions in Brillouin-zone averaging. The spectral changes with direction at ambient temperature furthermore agree very well with the predictions of a directtransition model assuming free-electron final-state dispersion and constant matrix elements. The direct and nondirect components in the temperature-dependent spectra are also determined.Keywords
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