1- Conventional X-ray :

Wavelength : CuKalpha
Bragg Brentano geometry
Diffractometer : Bruker D8 Advance
Filter : graphite monochromator in the diffracted beam
Soller 2, variable slits V6/V6, Soller 2, receiving slit 0.1mm. 

Sample pressed on a silicium zero-background holder - there
is a huge preferred orientation...

Files :
betha-X-conv.raw  :    Bruker/Siemens binary data - can be read by PowderX
betha-X-conv.uxd :     Bruker/Siemens ASCII data - can be read by WinPLOTR (INSTRM=9)
betha-X-conv.dat :      WinPLOTR/FULLPROF data (INSTRM=0)

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A. Le Bail


2 - Synchrotron data :

Capillary, rotating 5 degrees at each point.
Wavelength : 0.6995(1) Angstrom.
Diffractometer dimensions are 9999 and 330 mm, and the slit widths are each
8mm in the Finger model.  For programs such as GSAS and FULLPROF, the axial
divergence parameters S/L and D/L should be approximately 0.013.

Files are given as :
- bethcl.xye - columns are 2theta, normalized intensity,
and statistical esd.  This works as an .xye file in topas.
- bethclfp.dat - suitable for FULLPROF, to be read in with INSTRM=4.

The peaks are a bit lumpy on the leading edges.  We chopped
the crystals slightly before putting them in the capillary - perhaps the
grains are still a bit large.  It's pretty clear from the raw data that not
all the peaks have the same width, which suggests anisotropic strain
broadening.

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Peter W. Stephens, Professor
Department of Physics & Astronomy
State University of New York
Stony Brook, NY 11794-3800

