I would like to know if someone have test the evolution of the resolution versus the diameter of the goniometer.
We have in the lab a D8 with the Bragg-Brentano geometry, sollers 2�, Variable Slits (Divergent and Anti-Scattering), Sollers 2� with a secondary monochromator.( see Armel Web site for more information).
The resolution measured on Nist 1976 is roughly 0.045� for the first peak at 25� (K alpha copper) with the smallest diameter 430mm.
The goniometer diffractometer is ajustable to 430, 500 et 600mm.
Before testing this evolution by myself I would like to know if some one have done such test, what can we obtained in term of increase of the resolution, lost in counting, decrease of asymmetry at low angle�.
Fran�ois
Ma�tre de Conf�rences
Assistant Professor
Laboratoire des Oxydes et des Fluorures
Av. Olivier Messiaen
72000 Le Mans, France
Tel:02.43.83.33.53
Fax:02.43.83.35.06
http://www.univ-lemans.fr
