A quickish post that Bruker-AXS has released XRDWizard V2.9, which allows
for Variable Count Data (VCT) data collection, where the measurement time
is systematically increased towards higher 2-theta angles (Re Madsen and
Hill, 1992, 1994; and David, 1992 ). This allows users to takes advantage
of information present at higher angles, which is often hidden in the noise
in conventional fixed count time (FCT) powder X-ray diffraction data collection.
Bruker's TOPAS 4 now fully supports Variable Count Data format (Bruker
*.RAW binary, Madsen and Hill VCT format, and XYE)
http://www.bruker-axs.de/index.php?id=topas;
Extra information is on the web at:
http://www.bruker-axs.de/news_article.html?&tx_ttnews[tt_news]=106&cHash=8dc64eed75
Variable Counting Time - The golden standard for data collection
http://www.bruker-axs.de/uploads/media/Flyer_Variable_Counting_Time_VCT_H88-EXS_04.pdf
References:
Madsen, I.C. & Hill R.J. (1992): "Variable step-counting times for
Rietveld analysis or getting the most out of your experiment time,"
Adv. X-ray Anal., 35, 39-47
Madsen, I.C. & Hill R.J. (1994): "Collection and analysis of powder
diffraction data with near-constant counting statistics," J. Appl.
Cryst., 27, 385-392
David, W.I.F. (1992): "Accuracy in Powder Diffraction: Optimization of
data collection strategies," Abstract P2.6, NIST Special Publication
No. 846, Page 210
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If people have any information on VCT data collection ability in
other data collection software, feel free to follow-on.
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Lachlan M. D. Cranswick
Contact outside working hours /
Coordonnees en dehors des heures de travail:
NEW E-mail / courriel: lachlanc *at* magma.ca
Home Tel: (613) 584-4226 ; Cell/mobile: (613) 401-6254
WWW: http://lachlan.bluehaze.com.au/
P.O. Box 2057, Deep River, Ontario, Canada, K0J 1P0
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