[ Identification | Description | Input parameters | Links ]

The Powder1 Component

General powder sample with a single scattering vector.

Identification

• Site:
• Author: E.M.Lauridsen, N.B.Christensen, A.B.Abrahamsen
• Origin: Risoe
• Date: 4.2.98

Description

General powder sample with a single scattering vector. No multiple ,
scattering, no incoherent scattering, no secondary extinction.
The shape of the sample may be a cylinder of given radius or a box with
dimensions xwidth, yheight, zdepth.
The efficient is highly improved when restricting the vertical scattering
range on the Debye-Scherrer cone (with 'd_phi').
You may use PowderN to use N scattering lines defined in a file.

Example: Powder1(radius=0.015,yheight=0.05,q =1.8049,d_phi=0.07,pack=1,
j=6,DW=1,F2=56.8,Vc=85.0054,sigma_abs=0.463)

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
radius	m	Radius of sample in (x,z) plane	0.01
yheight	m	Height of sample y direction	0.05
xwidth	m	horiz. dimension of sample, as a width	0
zdepth	m	depth of box sample	0
q		Scattering vector of reflection [AA^-1]	1.8049
d	AA	d-spacing for sample, overrides 'q'	0
d_phi	deg,0-180	Angle corresponding to the vertical angular range to focus to, e.g. detector height. 0 for no focusing	0
pack	1	Packing factor	1
j	1	Multiplicity of reflection	6
DW	1	Debye-Waller factor of reflection	1
F2	barns	Structure factor of reflection	56.8
Vc	AA^3	Volume of unit cell	85.0054
sigma_abs	barns	Absorption cross section per unit cell at 2200 m/s	0.463

AT (	,	,		) RELATIVE		Generate
ROTATED (	,	,		) RELATIVE

Links

• Source code for Powder1.comp.
• Test results (not up-to-date).
• See also: Powder1, Powder2 and PowderN

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[ Identification | Description | Input parameters | Links ]

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Last Modified: Monday, 30-Jun-2025 11:05:10 CEST