Frank Laboratory of Neutron Physics

Department of Neutron Investigations of Condensed Matter

Topical seminar on nano-structures

Leader – V.L.Aksenov

Date and Time: Thursday, 18 April 2019, at 11:00 AM

Venue: DNICM Conference hall, bld. 42а, Frank Laboratory of Neutron Physics

Seminar topic: «Experimental approbation of reference layer method in resonant neutron reflectometry»

Speaker: Kravtsov E. A. (IMP UB RAS, Ekaterinburg)

Abstract:

We report on the first results on usage of resonant neutron scattering on Gd atoms in order to determine phase of reflection coefficient in neutron reflectometry. On the surface of samples under investigation there was deposited a reference layer of Gd, for which neutron scattering length density is enegry-dependent for slow neutrons. By measuring reflectivity for 3 wavelengths for every momentum transfer point we have solved the phase problem and determined modulo and phase of the reflection coefficient for unknown part of the sample.