Abstract
Alkali chloride thin films on Au(111) are investigated under ultrahigh vacuum conditions atroom temperature by noncontact atomic force microscopy in combination withKelvin probe force microscopy. Sample preparation is carried out in situ andoptimized in order to achieve a sub-monolayer coverage showing extended alkalichloride island formation. The local surface potential for LiCl, NaCl, KCl and RbClthin films on Au(111) was directly determined and compared to values of thebare Au(111) substrate. Hence, the absolute change in the local work functionΔΦ was evaluated. We observe a linear dependence betweenΔΦ and the ionic radius of the mentioned alkali chloride thin films.
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