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7.2 The Saxs_spheres McXtrace Component
Release: McXtrace 1.1
Sample for Small Angle X-ray Scattering - hard spheres in thin solution, mono disperse.
Identification
-
Author: E. B. Knudsen, P. Willendrup, K. Lefmann, L. Arleth
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Origin: DTU Fysik
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Date: 28.10.2010
Description
Sample for use in a SAXS instrument, models hard, monodisperse spheres in thin solution. The shape of the sample may be a filled box with dimensions xwidth, yheight, zdepth, a cylinder with dimensions radius and yheight, a filled sphere with radius R.
Example: Saxs_spheres(R = 20, Phi = 1e-3, Delta_rho = 0.6, sigma_abs = 50, xwidth=0.01, yheight=0.01, zdepth=0.005)
Input parameters
Parameters in boldface are required; the others are optional.
|
Name |
Unit |
Description |
Default |
|
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|
sphere_mtrl |
str |
Material datafile from which to find absorption. If none is given absorption is neglected. |
”” |
|
R |
Å |
Radius of scattering hard spheres |
100 |
|
Phi |
1 |
Particle volume fraction |
1e-3 |
|
Delta_rho |
fm/Å\(^{3}\) |
Excess scattering length density |
0.6 |
|
xwidth |
m |
Horiz. dimension of sample, as a width |
0 |
|
yheight |
m |
Vert . dimension of sample, as a height for cylinder/box |
0 |
|
zdepth |
m |
Depth of sample |
0 |
|
radius |
m |
Outer radius of sample in (x,z) plane for cylinder/sphere |
0 |
|
target_x |
m |
Position of target to focus at, along X |
0 |
|
target_y |
m |
Position of target to focus at, along Y |
0 |
|
target_z |
m |
Position of target to focus at, along Z |
6 |
|
target_index |
1 |
Relative index of component to focus at, e.g. next is +1 |
0 |
|
focus_xw |
m |
Horiz. dimension of a rectangular area |
0 |
|
focus_yh |
m |
Vert. dimension of a rectangular area |
0 |
|
focus_aw |
deg |
Horiz. angular dimension of a rectangular area |
0 |
|
focus_ah |
deg |
Vert. angular dimension of a rectangular area |
0 |
|
focus_r |
m |
Detector (disk-shaped) radius |
0 |
|
mu_c |
5 |
Column of the datafile which contains absorption coefficients. |
0 |
|
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Links
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Component source code found in file Saxs_spheres.comp.
A model of dilute hard spheres in solution for SAXS-use
