Abstract
The surface-induced dipole moments of single 5-d transition metal atoms adsorbed on the W(110) plane have been experimentally determined from field emission work function changes. The resulting values are found to be small (less than 0.5 Debye) and exhibit a monotonically decreasing behavior across the series from Ta to Pt. This same type of d-electron dependence is also found for the relative sizes of the field emission current jumps associated with adsorption of the various atoms on the W(110) plane. The data are interpreted using the concept of charge transfer, and a qualitative discussion of the adatom polarizabilities and desorption fields in relation to this model is given.
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