Surface electron affinity

[aschenk]

Hi,

I want to calculate the electron affinity of a surface. I know that there is a tutorial which shows how to do this for a single molecule, but is the process the same for a surface?

Thanks

[zh]

From the definition of electron affinity, I think than you employ the same procedure in the molecule case to estimate the electron affinity of a surface, i.e.,
the difference between the total energies of surface with N+1 electrons and  N electrons.