I agree that it's always best to avoid preferred orientation, but that is
easier said than done on a routine basis. I have personally had good luck
with the M-D PO correction on many known samples, as long as the PO was not
severe.
However, I imagine that Mario's problems are related to microabsorption in
this case. Mario, if you can re-measure your data with a Co or Fe tube, it
would be a good test of this.
Dave Bish
At 08:51 AM 10/28/2008 -0400, Martin wrote:
Sorry to disagree. Experience tells me otherwise - the March-Dollase
correction has nearly always led to poor quant results for me. It most
certainly cannot be applied safely.
Martin
------------------------------------------
M Vickers
Dept of Chemistry
UCL
----------
> Subject: Re: Quantitative analysis
> Date: Tue, 28 Oct 2008 02:53:20 -0700
> From: [EMAIL PROTECTED]
> To: Rietveld_l@ill.fr
>
> Dear Mario,
>
> One more possible problem of applying preferred orientation corrections
in QPA is that not all of them are normalized. For example, the
March-Dollase correction is normalized and can be applied safely, but the
Rietveld-Toraya correction is inapplicable to QPA as it does not preserve
the scale normalization.
>
> Best regards,
> Leonid
>
> *******************************************************
> Leonid A. Solovyov
> Institute of Chemistry and Chemical Technology
> K. Marx av., 42
> 660049, Krasnoyarsk Russia
> Phone: +7 3912 495663
> Fax: +7 3912 238658
> www.icct.ru/eng/content/persons/Sol_LA
>
----------
For the best free wallpapers from MSN Click here!
