Accession Number : ADA119193

Title :   Theory of Laser-Stimulated Surface Processes. I. General Formulation for the Multiphonon Relaxation of a Vibrationally Excited Adatom.

Descriptive Note : Interim technical rept.,


Personal Author(s) : Beri,A C ; George,Thomas F

PDF Url : ADA119193

Report Date : Aug 1982

Pagination or Media Count : 41

Abstract : A general expression is obtained for the rate of energy transfer from an adatom-surface bond in an excited vibrational state due to IR laser irradiation to vibrational modes of the solid. The rate is seen to involve time Fourier transforms of powers of a correlation function for the displacement of different lattice particles at different times, reciprocal-space Fourier components of a suitably chosen pair potential between the adatom and each lattice atom and a weight factor associated with the laser-excited state of the adatom-surface bond. This 'factorization' of the energy transfer rate into components depending on the properties of the laser, those of the adatom-surface bond and those of the solid provides a simple physical picture of the relaxation process within a rigorous framework and strongly suggests many points of departure towards more phenomenological approaches to laser-stimulated surface processes. (Author)

Descriptors :   *Laser beams, *Theory, *Processing, *Surface properties, Fourier transformation, Lasers, Simulation, Phonons, Relaxation, Vibrational spectra, Adatoms, Formulations, Crystal lattices, Correlation techniques, Irradiation

Subject Categories : Lasers and Masers
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE