Time of flight grazing incidence small angle neutron scattering |
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Authors: | P Müller-Buschbaum E Metwalli J-F Moulin V Kudryashov M Haese-Seiller and R Kampmann |
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Institution: | 1.Physik Department LS E13,Technische Universit?t München,Garching,Germany;2.Institut für Werkstoffforschung,Geesthacht,Germany |
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Abstract: | Grazing incidence small angle neutron scattering
(GISANS) overcomes the limitations of conventional small angle
scattering with respect to extremely small sample volumes in the
thin film geometry. In time of flight (TOF) mode neutrons with a
broad range of wavelengths are used simultaneously and recorded as
a function of their respective times of flight. The combination of
both, TOF-GISANS, enables the simultaneous performance of several
GISANS measurements, which differ in wavelength. As a consequence,
within one measurement a full set of GISANS pattern related to
different scattering vectors, different scattering depths and
resolutions result. This allows the detection of nanostructures
with a chemical sensitivity. The possibilities of TOF-GISANS are
demonstrated by the simple example of polymer nano-dots located on
top of a silicon surface. As probed with atomic force microscopy
(AFM) the nano-dots exhibit a large characteristic nearest
neighbour distance of 545 nm and a surface coverage of 28%. From
the analysis of the wavelength dependent data in combination with
AFM the mass density of the polymer nano-dots is determined to be
equal to the bulk value. A comparison to common single wavelength
GISANS experiments is shown. |
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