By Dr. R. P. Godwin (auth.)
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To discuss the vectorial effects arising in connection with optically excited plasma oscillations, we assume that the photoemission in a film is linearly related to the absorption of electromagnetic energy in the material. The photocurrent J from a volume element of material is then 1 J = f . --~- e2mlgl 2 ; (40) where IEl2/8n is the electromagnetic energy density in the material, ~othe frequency of the incident light, e2 the imaginary part of the dielectric constant, and f a factor describing the fraction of energy dissipated by emission of photoelectrons.
23 shows the reflectance as a function of oxygen exposure for 850 A p-polarized light incident on an AI film 150 A thick evaporated on a glass microscope slide [125]. The reflectance units correspond only approximately to absolute reflectance. The change in reflectance with oxidation can be qualitatively understood by inserting the optical constants of AI and A120 3 respectively in Eq. (28), the expression giving the normal-incidence reflectance of bulk material. The measured change 56 R. P. Godwin: in reflectance corresponds roughly to the difference between A120 3 and AI bulk reflectances.
The pulsed nature of the source should be an advantage in some types of experiments. 32 5. R. P. 1 Introduction Although the majority of experiments the reviewer will discuss involve optical studies of solids, it is appropriate to begin with atomic physics. Historically, of course, precise atomic spectroscopy led to quantum mechanics and then on to the understanding of the band structure of solids. In the xuv the connection between the optical properties of solids and atoms is even closer than at longer wavelengths.