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PHOTODESORPTION OF MOLECULAR ADSORBATES FROM METALLIC SURFACES

D. Bejan1,*

Affiliation

  1. Bucharest University, Faculty of Physics, Department of Optics, P.O. Box MG-11, 077125-Bucharest, Romania

Abstract

Photoinduced processes at surfaces are intimately connected with the dynamics of electrons and energy flow between substrate and adsorbate. Rapid progress in the experimental field, achieved with the advent of ultra-short laser pulses of high intensity and a wide range of excitation energy, stimulated a surge of various theoretical models. Desorption from metal surfaces exhibits some general properties like nonlinear yield dependence as function of the laser fluence, short desorption times, specific final state distribution. These characteristics are related to excitation or relaxation processes driven by the substrate carriers. In this review we present a panorama of classical and quantum models developed to describe photodesorption process at surfaces. As a specific example, we present the widely studied desorption of CO molecule from metallic surfaces..

Keywords

Desorption, Laser, Metal surfaces, Wave packet, Density matrix, Nonlinear yield.

Submitted at: Feb. 24, 2004
Accepted at: June 10, 2004

Citation

D. Bejan, PHOTODESORPTION OF MOLECULAR ADSORBATES FROM METALLIC SURFACES, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 2, pp. 359-384 (2004)