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Calorimetry at surfaces using high-resolution core-level photoemission
Authors:Santucci S C  Goldoni A  Larciprete R  Lizzit S  Bertolo M  Baraldi A  Masciovecchio C
Institution:Dipartimento di Fisica, Università di Perugia, Via A. Pascoli, 06123 Perugia, Italy.
Abstract:We have developed a method to measure simultaneously the internal energy of bulk and the first layer atoms of a crystal. The internal energy of bulk and the surface atoms of lithium (110) have been evaluated from 22 K up to above the melting transition, applying the Debye model to the thermal broadening of the respective 1s photoemission lines. Our measurements clearly reveal two phase changes: the known liquid to solid transition and the surface melting, occurring 50 K below the bulk melting point.
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