Leonid. Rietveld's code is indeed a specific type of profile refinement.
Structure parameters are refined to fit the observed profile intensities
using a least squares code similar to that used to fit integrated Bragg
intensities at Oak Ridge - ORFLS (1962). From 1961 profile refinement
methods were used at Argonne to fit multiple peaks to profile intensities,
and later at Petten. All references are given in vL&S
<http://journals.iucr.org/a/issues/2018/02/00/ib5058/>.
Unfortunately, the term "Rietveld method" has been applied to types of
profile refinement that are closer to earlier profile refinement methods,
such as refining the proportions of different phases where the individual
structures are known.
That is why I prefer to use Rietveld's original term "profile refinement"
for all kinds of powder pattern refinement, and reference Loopstra and
Rietveld (1969) instead of just Rietveld (1969). I would also call
quantitative phase analysis from powders "profile refinement" rather than
Rietveld refinement, and reference Werner et al. (1979).
______________________________________________________
Dr Alan Hewat, NeutronOptics, Grenoble, FRANCE
from my tablet
<alan.he...@neutronoptics.com> +33.476.98.41.68
http://www.NeutronOptics.com/hewat
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