Local enhanced site in enhanced infrared absorption

A local electric field may be enhanced in inhomogeneous metal films. This e nhanced field can be used to enhance the absorption bands of adsorbed speci es placed between metal islands. In this work, the range of a local enhance d field and the position of a local enhanced site are explained. Infrared a bsorption intensity for the C-O stretch mode of Fe(CO)(5) physisorbed at 90 K on 10 nm mass-thickness silver films, deposited in UHV onto germanium su bstrates at room temperature, has been measured at normal incidence of radi ation. On the basis of the surface morphology of the silver films, it was s upposed that the local enhanced field was almost limited to channel between islands in a physical mechanism.