A velocity spectrum is obtained by dispersing the photoelectrons with a uniform electrostatic field; it is recorded on an electronographic film with the help of an electronic camera. To each point of the plate correspond definite values of the tangential and normal velocities of photoelectrons. The angular and energetic distribution N(W, φ) is calculated from the density of the electronographic plate. We hereby show the first structures obtained from thin films of gold.
2014 Cet exposé rend compte de quelques résultats obtenus ces dernières années sur les points suivants : Domaine de validité de la formule de Fowler, méthode des films minces, conditions nécessaires pour un grand rendement quantique, influence des états de surface et de la courbure de bande, problèmes de l'ultraviolet lointain. Abstract. 2014 This is a summary of some results obtained during recent years, about the following points : Field of validity of the Fowler formula, influence of polarization, method of thin films, conditions for a large quantum yield, influence of surface states and band bending, problems in the far ultraviolet.
We defined surface and volume components of photoemission and an experimental process to separate them. The reflectance, transmittance, and photoelectric yield were measured from silver thin films for p and s polarizations, for front and back illumination through the silica substrate, for angles of incidence ranging from 0' to 75', and for photon energy ranging from 3.5 to 4.5 eV. We calculate values of the index of refraction, the escape depth of the photoelectrons, and the surface to volume photoyield ratio. The consistency of these values with redundant sets of experimental data is evidence for the validity of our model which assumed no surface roughness. We show that plasma resonance is important but only because it is associated with particular distribution and orientation of the electric field. We suggest that in silver the photoelectric threshold for volume effect might be larger than that for surface effect.
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