Re: [sdpd] Synchrotron powder diffraction

[Lachlan Cranswick <L.M.D.Cranswick...@dl.ac.uk>]

At 09:23 09/09/01 -0400, you wrote:
>
>Lachlan,
>
>For the record, when is the last time you had direct experience with powder
>diffraction at a synchrotron source?
>
>Peter W. Stephens

(besides being located at a synchrotron and synchrotron users from 1998 to 2001)
For the record: most recent "official" "hands-on beam time"       : 1995
For the record: most recent "association" with synchrotron PXRD data - 
 mainly on the analysis of flawed, problematic synchrotron data   : 2001 
 (unlike laboratory data - flawed synchrotron data can't easily 
  be thrown the bin and recollected - it has to be used)

----------------

Though I would now take the opportunity to sort of reverse 
the question.  For the record, when was the last time a team 
designing a powder beamline evaluated commercially available, 
"proven", integrated laboratory PXRD systems to see if they
were also suitable for high reliability synchrotron work?

e.g.,
  integrated commercial "Fire and forget" high quality hardware;
  including automatic sample changers,  hardware for specialist 
  research (i.e., micro-diffraction X-Y mapping systems - as already 
  made by Rigaku or Bruker), integrated data-collection / analysis 
  software, automated self alignment, routinely usable and changeable 
  modular components, emphasis on high reliability and 
  throughput (I would suggest that many of the commercial 
  vendors would not be in business if they had not achieve 
  this)

I guess the overall query then becomes - what is "special"
about the synchrotron for "user" beamlines - it is the "beam"
or the diffractometer "hardware"?
In the case of the Daresbury "dedicated" user beamline 9.8 - 
the answer seems to be that it is the synchrotron beam
that is "special".  As long as there is something reliable 
and easy to use at the receiving end - marvelous, easy to 
analyse data will result (in the case of 9.8 - this is 
due to a proven, integrated, commercial Bruker CCD Smart 
diffractometer system)

(and of course a good person to manage the beamline).

Lachlan.

-----------------------
Lachlan M. D. Cranswick
Collaborative Computational Project No 14 (CCP14)
    for Single Crystal and Powder Diffraction
  Birkbeck University of London and Daresbury Laboratory 
Postal Address: CCP14 - School of Crystallography,
                Birkbeck College,
                Malet Street, Bloomsbury,
                WC1E 7HX, London,  UK
Tel: (+44) 020 7631 6849   Fax: (+44) 020 7631 6803
E-mail: l.m.d.cranswick...@dl.ac.uk
WWW: http://www.ccp14.ac.uk


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