Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Poster Session I

CPP 24.50: Poster

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

Grazing incidence scattering for the study of buried interfaces — •Max Wolff — Department for Physics and Astronomy, Uppsala University

Neutrons can penetrate deeply into matter and are sensitive to light elements. If applied under grazing incidence beam geometry they offer surface sensitivity and the opportunity to address highly relevant scientific challenges on solid-liquid boundaries, like e.g. the hydrodynamic boundary condition. From specular reflectivity the density profile, along the normal of the interfaces, of a liquid close to a solid substrate can be extracted.

Lateral correlations, parallel to an interface, are accessible by off-specular (µm) or grazing incidence scattering (nm length scale). Moreover, by using time of flight (TOF) methods a range of Q (momentum transfers) vectors and related penetration depth can be addressed. In turn the measurements are flux hungry and demanding with respect to brilliance of the source. This in combination with the low absorption of the neutrons in the liquid limits the achievable depth resolution. A combined approach of further improved instrumentation and sample design may allow to overcome this limitations by careful control of the wave amplitude using reference layers and resonators.