Phys. Rev. B 66, 125401 (2002) [5 pages]Temperature-dependent work functions of free alkali-metal nanoparticlesReceived 22 April 2002; published 4 September 2002 Photoionization yields have been measured as a function of temperature for the alkali metals Li, Na, and K in the form of free nanometer-sized clusters in a beam. The data can be fitted very well by a finite-temperature Fowler plot, originally derived for bulk surfaces. The resulting temperature-dependent ionization thresholds match precisely the literature work function values and are, within the experimental uncertainties, in agreement with recent theoretical models for thermal shifts of the work function. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.66.125401
DOI:
10.1103/PhysRevB.66.125401
PACS:
79.60.-i, 73.30.+y, 36.40.Vz
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