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,
Parameters in boldface are required;
the others are optional.
Radius of sample in (x,z) plane
Height of sample y direction
horiz. dimension of sample, as a width
depth of box sample
Scattering vector of reflection
d-spacing for sample, overrides 'q'
Angle corresponding to the vertical angular range
to focus to, e.g. detector height. 0 for no focusing
Multiplicity of reflection
Debye-Waller factor of reflection
Structure factor of reflection
Volume of unit cell
Absorption cross section per unit cell at 2200 m/s