-----Urspr�ngliche Nachricht-----
Von: Cheng DONG <[EMAIL PROTECTED]>
An: RIETVELD_L Distribution List <[EMAIL PROTECTED]>
Datum: Freitag, 12. Februar 1999 10:30
Betreff: Re: Ka2 separation
>At 05:23 PM 2/12/99 +1100, you wrote:
>>
>>There is an Cu Ka2 elimination algorithm described in:
>>J.Appl.Cryst. 8 (1975) p.499-506 by J.Ladell, A.Zagofsky and S.Pearlman
>>
>>====================================================
>>Marek W. Schmidt
>>Department of Applied Mathematics
>>Research School of Physical Sciences and Engineering
>>Australian National University
>>====================================================
>>
>>On Fri, 12 Feb 1999, Nita DRAGOE wrote:
>>
>>> Hello
>>>
>>> I am in a search for references concerning Kalpha 2 stripping methods
>>> (except that one of Rachinger from 1930 or so...). I would appreciate
>>> if someone points me in the right direction.
>>>
>>> Another question (easy ?) for people more in the knowledge than me:
>>>
>>> In a typical laboratory XRD experiment (without incident
>>> monochromator) one get the overlap of the diffraction with Ka1 and Ka2
>>> (neglect Kbeta now).
>>> If we separate these two contributions and assume that Ka2 is a
>>> statistically "independent" experiment we can obtain two data sets (I
>>> think we can assume that they are "independent", is the ergodic(?)
>>> theory). If we make Rietveld refinement on both of them we should get
>>> the results with different standard deviations since sin(theta)/lambda
>>> and intensities are different.
>>> What do you think is the relation between Rwp of these two data sets
>>> and the original (i.e. overlapped) one ?
>>> Because I don't know why this procedure is not applied I guess it is
>>> meaningless. Why ?
>>>
>>> Thanks for comments,
>>> N
>>> --
>>> Nita DRAGOE
>>> http://www.hongo.ecc.u-tokyo.ac.jp/~tdragoe
>>> ____________________________________________________
>>>
> We have developed a new and more accurate Cu Ka2 elimination algorithm
>which will be published in the next issue of J.Appl.Cryst. (1999) by Cheng
>Dong, Hong Chen & Fei Wu.
> This new algorithm together with modified version of the previous
>algorithms of Rachinger and Ladell are implemented in our x-ray data
>analysis program "PowderX", which is freely distributed to academic users.
>
>Cheng Dong
>
>Dr. Cheng Dong
>Institute of Physics | Tel. 86-10-62582173
>Chinese Academy of Sciences | Fax. 86-10-62568834
>P.O.Box 603, Beijing 100080,|E-mail [EMAIL PROTECTED]
>P.R. China
It's better to use a Guinier-Monochromator to eliminate that bloody Ka2.
Then you can forget about those stupid calculations.
Michael
===============================
Dr. Michael Nippus
Huber Diffraktionstechnik GmbH
Sommerstr. 4
D-83253 Rimsting / Chiemsee
Germany
Tel. ++49 (0) 8051 6878 14
Fax. ++49 (0) 8051 6878 10
[EMAIL PROTECTED]
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