Design of and measurements with a simple double crystal spectrometer for small angle scattering

1952 ◽  
Vol 2 (1) ◽  
pp. 217-226 ◽  
Author(s):  
H. Daams ◽  
J. J. Arlman
Keyword(s):  
Small Angle ◽  
Small Angle Scattering ◽  
Crystal Spectrometer ◽  
Double Crystal ◽  
Angle Scattering

Ultra small Angle Neutron Scattering from Amorphous Ni-Pd-P-Alloys

1993 ◽  
Vol 48 (12) ◽  
pp. 1203-1206
Author(s):  
R. M. Hagenmayer ◽  
C. M. E. Zeyen ◽  
P. Lamparter ◽  
S. Steeb
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Small Angle Scattering ◽  
Surface Scattering ◽  
Immersion Method ◽  
Crystal Spectrometer ◽  
Double Crystal ◽  
Angle Scattering ◽  
Q Values

Abstract Using a neutron double crystal spectrometer, thin amorphous Ni-Pd-P-samples were investi-gated at very small Q-values (10-5 Å -1 ≦Q≦10 -3 Å -1). The immersion method shows that the small angle scattering effect is mainly caused by surface scattering.

An X-Ray Small-Angle Scattering Instrument

1967 ◽  
Vol 11 ◽  
pp. 332-338 ◽  
Author(s):  
Donald M. Koffman
Keyword(s):  
Small Angle ◽  
Scintillation Counter ◽  
Small Angle Scattering ◽  
High Angular Resolution ◽  
X Ray Diffraction ◽  
Multiple Diffraction ◽  
Double Crystal ◽  
X Ray ◽  
Angle Scattering ◽  
Diffraction Patterns

AbstractAn X-ray small-angle scattering instrument is described which is used for recording X-ray diffraction patterns or small-angle X-ray scattering curves in an angular region very close to the direct beam. The measurement of X-ray intensity is accomplished with standard geiger or scintillation counter techniques. The instrument is designed for use with a spot-focus or vertical-line X-ray source, In essence, it is a multiple-reflection double-crystal diffractometer, based on a concept developed by Bonse and Hart, employing two grooved perfect germanium crystals arranged in the parallel position. Multiple diffraction from these crystals produces a monochromated X-ray beam which can be several millimeters wide while still exhibiting extremely high angular resolution. As a result, effective sample volumes can be employed with maximum volume-to-thickness ratios. The principal features of the instrument are discussed with emphasis on the advantages of this device over those employing complex slit systems and film-re cording techniques, Data are presented to illustrate the operation, intensity, and resolution of the unit.

Analysis of neutron double-crystal diffractometer scattering curves including multiple scattering

2002 ◽  
Vol 35 (1) ◽  
pp. 75-81 ◽  
Author(s):  
P. Staron ◽  
D. Bellmann
Keyword(s):  
Multiple Scattering ◽  
Small Angle ◽  
Volume Fraction ◽  
Numerical Procedure ◽  
Transformation Method ◽  
Single Scattering ◽  
Small Angle Scattering ◽  
Size Distributions ◽  
Double Crystal ◽  
Angle Scattering

Double-crystal diffractometers (DCD) of the Bonse–Hart type are used for small-angle neutron scattering (SANS) experiments with very high resolution. Scattering from inhomogeneities in the size range of typically 100 nm to 10 µm can be detected with a DCD. The evaluation of DCD scattering curves is more complicated than for conventional SANS instruments with point collimation for two reasons: first, a DCD operates with a long-slit geometry, and second, owing to the high scattering power of large inhomogeneities, multiple small-angle scattering is likely to play a significant role in many DCD experiments. A numerical procedure is proposed for the determination of particle size distributions from DCD scattering curves influenced by multiple scattering. This procedure is based on ann-fold convolution of single-scattering cross sections, wherendepends on the degree of multiple scattering. It makes use of the indirect Fourier transformation method and thus, firstly, size distributions of arbitrary shape can be determined, and secondly, the calculation is fast, allowing an interactive analysis. The procedure is demonstrated with scattering from latex particles with different degrees of multiple scattering. The results show that the size and volume fraction of the latex spheres can be determined with a reasonable error even from scattering curves that are strongly influenced by multiple small-angle scattering.

Refraction and ultra-small-angle scattering of X-rays in a single-crystal diamond compound refractive lens

2017 ◽  
Vol 24 (6) ◽  
pp. 1137-1145 ◽  
Author(s):  
S. Gasilov ◽  
A. Mittone ◽  
T. dos Santos Rolo ◽  
S. Polyakov ◽  
S. Zholudev ◽  
...  
Keyword(s):  
Single Crystal ◽  
Small Angle ◽  
Small Angle Scattering ◽  
X Rays ◽  
Double Crystal ◽  
Suggested Approach ◽  
Wavefront Aberrations ◽  
X Ray ◽  
Angle Scattering ◽  
Single Crystal Diamond

In this work a double-crystal setup is employed to study compound refractive lenses made of single-crystal diamond. The point spread function of the lens is calculated taking into account the lens transmission, the wavefront aberrations, and the ultra-small-angle broadening of the X-ray beam. It is shown that, similarly to the wavefront aberrations, the ultra-small-angle scattering effects can significantly reduce the intensity gain and increase the focal spot size. The suggested approach can be particularly useful for the characterization of refractive X-ray lenses composed of many tens of unit lenses.

Small angle scattering study of silica gels and zeolites

1993 ◽  
Vol 03 (C8) ◽  
pp. C8-393-C8-396
Author(s):  
T. P.M. BEELEN ◽  
W. H. DOKTER ◽  
H. F. VAN GARDEREN ◽  
R. A. VAN SANTEN ◽  
E. PANTOS
Keyword(s):  
Small Angle ◽  
Small Angle Scattering ◽  
Silica Gels ◽  
Angle Scattering ◽  
Scattering Study
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