Charge transfer in chemisorption: N and Si on Al

In this paper, within an ab initio framework, we are able to calculate the charge transfer er of N and Si adatoms on an Al surface described as jellium. We find Q(T) = 0.53 electrons for N, and Q(T) = 0.31 electrons for Si, at the adatom-surface equilibrium distance. This indicates a more ionic character of the N chemisorption bond on Al. These results are confirmed by a spectral analysis of both bonds.