Larmor encoding and Fourier reconstruction for wavelength dispersive reflectometry

As is well known the Larmor precession of the neutron polarization passing through a range of homogeneous magnetic field can efficiently be used for perfectly harmonic modulation of incoming (or scattered) intensity as a function of neutron wavelength. We show that the Fourier analysis of a few refl...

Full description

Saved in:
Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2007-07, Vol.397 (1), p.141-143
Main Authors: Toperverg, B.P., Kampmann, R., Lauter-Pasyuk, V.V., Lauter, H.J., Tietze, U., Solina, D., Schreyer, A.
Format: Article
Language:English
Subjects:
Fourier series
Larmor precession
Polarized neutron reflectometry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:As is well known the Larmor precession of the neutron polarization passing through a range of homogeneous magnetic field can efficiently be used for perfectly harmonic modulation of incoming (or scattered) intensity as a function of neutron wavelength. We show that the Fourier analysis of a few reflection curves obtained at a proper set of Larmor frequencies allows to numerically reconstruct the genuine reflectivity curve in great details even in the case it has been measured with a rather purely monochromatized beam. It is argued that the method can be used to substantially improve wave length resolution with moderate increase in measuring time. Further applications of the method, e.g. to small angle scattering at grazing incidence (GISANS), are briefly discussed.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2007.02.097