Physisorption may cause a dimple on a deformable solid surface due to adsorbate-substrate interaction.The interactive force between the adsorbate and the crystal atoms depends on their distances,which may change with substrate deformation.This feature of displacement-dependence indicates that the equilibrium problem is a force-deformation coupled nonlinear procedure.In the present study,a continuum mechanics model,in which the force is considered as a function of the displacement field of the medium,is presented to calculate the physisorption-inducad deformation in a semi-infinite elastic medium.It is found that the nonlinear effect due to force-deformation coupling should be taken in consideration in the adsorbate-substrate interaction analysis.