I do not recommend using this format. Better choices are the ESD
variant on this, where numbers are alternated intensity, esd,
intensity... (and there are a lot more digits for each number) or the
FXYE format, which has angle, intensity, and optionally esd, one
entry per line in free format.
My recollection on this is that YO is the total number of counts, so
the normalized Intensity = YO/n and the error on that is SQRT(YO)/n.
The idea being that not all measurements are made with the same
number of detectors.
Brian
On Mar 16, 2009, at 12:02 AM, matthew.row...@csiro.au wrote:
Hi all
I'm going over the GSAS data format (by reading the manual), trying
to figure out how it works, and I've come up with a couple of
questions:
1) In a STD data set, the manual says that NCTR is the number of
counters and YO is the n number of counts per counter.
So, for a single data point " 3 3452", is the total counts =3*3452?
What is the error? Sqrt(3*3452), 3*sqrt(3452) or sqrt(3452/3)?
2) What is the data format for type = "ALT"? The manual (http://
www.ccp14.ac.uk/ccp/ccp14/ftp-mirror/gsas/public/gsas/manual/
GSASManual.pdf) doesn't say...
Cheers
Matthew
________________
Matthew Rowles
CSIRO Minerals
Box 312
Clayton South, Victoria
AUSTRALIA 3169
Ph: +61 3 9545 8892
Fax: +61 3 9562 8919 (site)
Email: matthew.row...@csiro.au
********************************************************************
Brian H. Toby, Ph.D. office: 630-252-5488
Senior Physicist/Materials Characterization Group Leader
Advanced Photon Source
9700 S. Cass Ave, Bldg. 433/D003 work cell: 630-327-8426
Argonne National Laboratory secretary (Marija): 630-252-5453
Argonne, IL 60439-4856 e-mail: brian dot toby at anl dot gov
********************************************************************
"We will restore science to its rightful place, and wield
technology's wonders... We will harness the sun and the winds and the
soil to fuel our cars and run our factories... All this we can do.
All this we will do."
