Theory of collisioninduced ionization of adsorbed species on solid surfaces in the presence of laser radiation
Abstract
A formalism is proposed for treating the problem of ionization of adsorbed species on solid surfaces. The ionizing agents are taken to be impact atoms and laser radiation with frequency low compared to the inverse of characteristic collision times. The physical constraints of short collision times and low laser frequency then allow one to treat the adatomsurfaceplusfield system under the quasistatic approximation (QSA) and the impactatomadatomsurface collision dynamics under the impulse approximation (IMA). The latter leads to a timedependent ionization crosssection which is factorizable into the square of an electronatom scattering matrix element and a spectral function describing the energymomentum distribution of electrons in the adatomsurfaceplusfield system. The formalism focuses on the spectral function which is shown to be derivable from a single particle Green's function exactly calculable for the present problem.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 May 1983
 Bibcode:
 1983STIN...8332059L
 Keywords:

 Adsorption;
 Ionization Cross Sections;
 Laser Outputs;
 Radiation Effects;
 Solid Surfaces;
 Electron Energy;
 Green'S Functions;
 Time Dependence;
 Lasers and Masers