By M. Cardona, R. K. Chang, G. Güntherodt, M. B. Long, H. Vogt
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Additional info for Light Scattering in Solids II: Basic Concept and Instrumentation
Sample text
Another experimental consideration concerns the fact that the scattered light is focussed onto the entrance slit of the spectrometer by a collecting lens. 0). 53) f2i = 27:(1 - cos Oi) and O o = 2n(1 - cos Oo), where the angle O~ is related to that of the refracted ray outside through Snell's law. 5 and 2. Hence the maximum values of the angles O o lie around 15 °. The corresponding angles O i are much smaller because of the usually large refractive indices (for Ge n=4). 54) \ n~/ " The cross sections and efficiencies given above must be multiplied by this factor to relate theory to the experimental data.
In the remaining sections we present experimental results (some had already been given as an illustration to the theoretical parts), Emphasis is on germanium and zincblende-type materials. We give examples of first-order allowed and forbidden scattering near E o and Eo+A o, and near E~ and E 1 + A 1. From these data, several deformation potentials are obtained. We also showexamples of resonances in the two-phonon scattering efficiencies and their application to the determination of electron two-photon coupling constants.
59) 46 M. Cardona where Rrp is a component of R which belongs to the same irreducible representation as the phonon p. g. magnons) the Raman tensor can have antisymmetric components. We should point out that the discussion above is based on having assumed that the scattering vector is exactly zero (q = 0) or conversely, that it does not depend on q (dipole approximation). , the F25 phonon of Cu20, Sect. 6), in particular, for polar phonons involving the Fr6hlich interaction (Sect. 8). It is also obviously not true for Brillouin scattering; q = 0 implies a rigid translation of the system for which d)~/d¢ =0.