Oscillations in the reflectivity of a diffuse polymer layer. An analogy with the Ramsauer Townsend effectReport as inadecuate




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Abstract : The reflectivity of a diffuse, finite layer of adsorbed polymers is examined. If the bulk solution is semi-dilute, the screening structure generates oscillations in the reflectivity function in the vicinity of total reflexion. The deviation with respect to the Fresnel law increases with the depth of the layer. In the limit of infinite depth the reflectivity function displays the discontinuity first predicted by Schack Thesis, Munich 1986 and first observed by Guiselin Europhys. Lett. 17 1992 57. In our approach, we make use of earlier results obtained by Morse and Feshbach in their interpretation of the Ramsauer-Townsend effect of slow electrons scattered by heavy atoms.






Author: G. Jannink

Source: https://hal.archives-ouvertes.fr/



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