A strong temperature dependence has been observed for the first time in angle-resolved photoemission (ARP) spectra of the valence band of a crystalline solid. This spectral behavior confirms predictions of a model suggested by Shevchik. A controversial point in the interpretation of ARP spectra at x-ray energies is resolved by this model. Moreover, it dictates the choice of photon energy and sample temperature for future ARP studies of valence-band electronic structure.Shevchik 1 has suggested that thermal broadening leads to a more complete sampling of the first Brillouin zone (BZ) in angle-resolved x-ray photoemission than would be expected from a rigorous directtransition model. He expressed the angle-resolved photoemission cross section as the sum of a fc-conserving direct-transition term and an atomic term, with the relative contributions of the two being governed by the Debye-Waller factor, which we shall write aswhere 5=1^-1^ -S ftI/
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