We compute different adsorption forms for different surface sites, at top,
at saddle points (at bridges), and in four-fold (hollow) positions. Then we
show that this type of physics is closely related to continuum mechanics,
apart from surface chemistry. We use a two-body potential as our basis for
the calculation of the potential of the gas particle produced by the surfac
e sites. This potential is taken as a combination of a simple harmonic pote
ntial and the Lennard-Jones potential, and is established in particular for
the H/Cu(100) surface. It includes the chemisorption and physisorption pro
cesses simultaneously. In this paper, we have calculated the static surface
potential V-s((r) over right arrow) of H/Cu(100) as an exemplary adatom-su
rface system by pair-wise additivity. The calculations give good results an
d offer a very realistic interpretation. From these results, we assume that
the surface formed by Cu provides a source for the ad-H-atoms for some ela
stic or plastic deformation under forces. Under this consideration, the ela
stic or plastic deformation is related to the second derivatives of "the su
rface potential tensor function" parallel to the surface direction and perp
endicular to the surface direction. Pictorially, we can thus predict the be
havior of an H-atom at a sticking equilibrium position on a Cu(100) surface
.