On the other hand, charge-transfer and dispersion driving forces (ECT+EDISP) stand for up to 30% of the stability in the As(III)-PhosO complex, in agreement with a weak electron transfer (<0.1|e|) in the As(III)→PhosO direction. In contrast, polarization stabilizing effects (EPOL) are weak at the equilibrium distances, with contributions lower than 7% for neutral adsorbates because it is predominantly a short-range term.