Temperature-dependent work functions of free alkali-metal nanoparticles
- 4 September 2002
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 66 (12) , 125401
- https://doi.org/10.1103/physrevb.66.125401
Abstract
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.Keywords
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