Hi all,
On Tue, 28 Mar 2000 16:13:11 +0200, Armel Le Bail wrote:
>I have a related question about the so-called Kalpha3.
>Trying to take account of it, I only obtain some slight increase
>in the Rp and Rwp, though the fit seems to have improved,
>at first glance.
>
>Has someone a powder pattern available which shows clearly
>Kalpha3, and which he was able to fit by a Rietveld code
>(which one ?) and obtained some improvement in the Rp
>and Rwp values ?
I have no hints about Kalpha3. But some related hint: Several years ago,
we were believing for Kalpha3 or some related satellite lines of the Kalpha
doublet really to disturbe our fundamental parameters lines. In the
beginning of 1999, we found out the so-called "tube-tails" (which better
should be called "focus tails"). For example, have a look at
www.bgmn.de/tubetails.html
which shows an equatorial focus scan for an AEG tube. The tube tails are
clearly visible. We have corrected our FPA model for this. Compare
figs. (a) and (b) on bottom. Rwp is
-uncorrected (a) 16.95%
-corrected (b) 12.49%
for Rexp being 10.51%. One may confuse the tube tails influence with
Kalpha3.
J"org Bergmann
