Journal Article

PreJuSER-22259

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Scattering depth correction of evanescent waves in inelastic neutron scattering using a neutron prism

Frielinghaus, H.FZJ* ; Holderer, O.FZJ* ; Lipfert, F.FZJ* ; Monkenbusch, M.FZJ* ; Arend, N.FZJ* ; Richter, D.FZJ*

2012
North-Holland Publ. Co. Amsterdam

This record in other databases:    

Please use a persistent id in citations: doi:10.1016/j.nima.2012.05.064

Abstract: Grazing Incidence Neutron Spin Echo Spectroscopy (GINSES) has recently been applied to measure the dynamics of surfactant membranes close to a hydrophilic silicon wall. The scattering depth of the evanescent wave inside the microemulsion depends strongly on the angle of incidence and the wavelength. The inherently low scattering intensity of GINSES measurements, however, requires the integration over a rather broad wavelength band. In particular, at a pulsed source the instrument operates with a broad wavelength band covering all neutrons within one frame between two pulses. In order to yield viable counting statistics it is highly desirable to integrate data corresponding to significant fractions of the wavelength band. Therefore, in a normal reflectometry setup the penetration length would be smeared and blur the depth dependence of the experimental results. Here we describe a new method to strongly mitigate this effect and show its application in a GINSES experiment at the neutron spin echo instrument at the Spallation Neutron Source (SNS). A prism in front of the sample was introduced in order to adapt the angle of the incoming beam according to the wavelength by this optical component. As an example an experiment on a bicontinuous microemulsion using these neutron optics is presented. (C) 2012 Elsevier B.V. All rights reserved.

Keyword(s): Instrument and Method Development (1st) ; Others (1st) ; Instrument and Method Development (2nd) ; J ; Neutron spin echo (auto) ; Prism (auto) ; Grazing incidence (auto)

Note: This research at Oak Ridge National Laboratory's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy.

---

Contributing Institute(s):

1. Neutronenstreuung (ICS-1)
2. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
3. Neutronenstreuung (JCNS-1)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (FUEK505) (FUEK505)
2. 544 - In-house Research with PNI (POF2-544) (POF2-544)

Experiment(s):

1. External Measurement

Appears in the scientific report 2012

---

Database coverage:
; Current Contents - Life Sciences ; Current Contents - Physical, Chemical and Earth Sciences ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

---