Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Poster Session I

CPP 24.33: Poster

Monday, March 16, 2020, 17:30–19:30, P3

The Gradient Contribution to Light Scattering in an Interface Layer — •Reinhard Sigel — 88677 Markdorf

The effect of the refractive index gradient in an interface layer on the diffuse interface scattering is investigated theoretically. An extension of the transfer matrix method for a layered interface profile by small fluctuations in the layers provides predictions for diffuse interface light scattering. While the s-polarization follows the conventional wave equation, there is an extra term with a first order derivative in the wave equation for p-polarization. Within the transfer matrix method there are step-like gradients located at the layer boundaries. The gradient term in p-polarization produces an extra scattering contribution at the layer boundaries. It becomes significant for an evanescent wave illumination with an angle of incidence close to the critical angle and can be used for a new approach to depth resolution in interface scattering experiments. A comparison to the Distorted Wave Born Approximation (DWBA) which is highly celebrated within the X-ray community is discussed.