When it comes to charge transfer, the strength of a and b M!L charge transfer to C and CH 2 adsorbates are approximately constant across the metals in Figure . As an example, Figure (d) shows that 0.178 alpha electrons (0.131 e in Table ) migrated from mostly the d orbitals of the 4 closest Pt atoms to the 2p x orbital of the C atom (whose occupancy was reduced during the polarization stage). On the other hand, the L!M donation was more substantial in the cases of Pt 30 and Rh 30 , where electrons can be injected into the partially filled d orbitals of the clusters. For instance, 0.293 e (0.418 e in Table ) was transferred from the 2p y orbital of C atom to the d orbitals of the neighboring and farther-away Pt atoms shown in Figure .