The rotation of the plane of polarisation and the ellipticity of the reflected light at both sides and the transmitted light through magnetically saturated evaporated layers (30 mti) of iron, cobalt and nickel are measured in the near I.R. and the visible spectrum (2"5 to 0"43 [~). The four measured magnetooptical angles are dependent one another according to the theory of VOlOT. They are found independent however each other. That can be explaned only by a magnetooptical term in the second equation of Maxwell too, if the layers are homogenous. This term is calculated and gives rise to a considerable portion of the magnetoopticM effects. The transmitted light gains a rotation and ellipticity not only in the interior of the metal but also on the surfaces. This surface-change surpasses that in the interior in the I.R. region. It Call be determined by extrapolating on the thickness zero or by calculating out of the measured Kerr-effect. Both methods agree well. This is a convincing prove that non-magnetical surface-layers are there not existing. The magnetooptical rotation of Nickel has a sharp peak at I V, the other magnetooptical constants, include the calculated magneticM terms show a more monotonous course with the wavelenght, also for the other metals. The optical constants are determined by measurements of intensity of the reflected light on both sides of the layer and of the transmitted light.
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