VIBRATIONAL-MODES OF A TERMINATED ATOMIC CHAIN

A complex terminated molecular chain adsorbed at the surface is analyz ed without taking into account periodic boundary conditions and transl ational invariance approximation. The solution of the motion equation is a standing wave. The dispersion equation for band modes is obtained and conditions for the existence of localized states are investigated . The constructed parametric diagrams make it possible to evaluate vib rational bands and local modes (if they exist) for (SN)(x) and C-C sam ples. It is proposed that excitations of local and band modes of adsor bed molecules can be used for low temperature laser cleaning of the su rface and for molecular engineering purposes. (C) 1997 American Instit ute of Physics. [S1063-777X(97)01011-6].