Energy distribution in field emission from adsorbate-covered surfaces

A calculation of the total-energy distribution of field-emitted electrons in the presence of chemisorbed atoms shows that [j(ω)-j0(ω)]j0(ω)=ImGaa(ω)exp[(-2mω2)12xa], where j(ω) and j0(ω) are the current densities in energy in the presence and absence of absorbate, respectively; ω is measured from the vacuum level; xa is the surface-absorbate distance; and π-1ImGaa is the local density of states at the absorbate. This result is general and independent of the explicit form of Gaa.