A.C.Hannon Interfere and Merge in Excel
page 5
by putting them into files named .ALF, .LIN and .LIM respectively. The appendix shows typical
examples of these parameter files. The ATLAS program area g_f contains template files, named
g_f:TEMPLATE.ALF for example, which may be used as a basis for producing parameter files for use
with the ATLAS programs.
The .ALF file contains the renormalising factors
α
i
and is used by the ATLAS program
INTERFERE to perform the operation defined by Equation (1). The output file from INTERFERE has
extension .INT.
The .LIN file contains the linear correction parameters
A
i
and B
i
. If a linear correction is to be
performed then this may be done in GENIE by running the program @g_f:LINT and this should be
done after running INTERFERE and before running MERGE. Note that this program is not described in
the ATLAS manual. The input to this program is a file with extension .INT, whereas the output has
extension .LNT. If a linear correction is made to the data then care should be taken when running
MERGE to use the .LNT file, rather than the .INT file.
The .LIM file contains the minimum and maximum values of
Q for each of the groups to be
included when running MERGE.
After running the ATLAS programs with the parameters determined using the Excel workbook
it is advisable to check carefully whether it is necessary to fine-tune some of the parameters.
7. Additional points
The software (both PC.COM and INTMER.XLS) has been set up so that the data are treated
with a maximum
Q of 40Å
-1
and a Q-spacing of 0.1Å
-1
. In order to treat the data with a different set of
Q-values it is necessary to do two things:
1. Copy the file PC.COM from g_f to your own area and change the two lines containing a REBIN
command (reb w1 0 (0.1) 40) to have the required maximum
Q and Q-spacing.
2. Modify the Excel workbook to cover the required
Q-range. If the number of points is to be
increased then this involves extending downwards the defined cells on the worksheets DCS2, INT
and MERGE. It is also necessary to extend the range of data plotted on each worksheet.
The Excel workbook INTMER.XLS has been set up with protection so that it is not immediately
possible to change anything other than the values for
α
i
, A
i
, B
i
and the Q-limits, and these may only
be changed on the correct worksheet. This protection can be turned off from the Tools menu in Excel
(no password is necessary).
(55 Seiten)
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