Structure factor least squares using multipole form factors
Description:
-
Main program for least squares refinement, of structure factors with
Multipole description of form factors
Extinction corrections can be included and the extinction parameters refined.
Geometric slack constraints can be included (see chaper 5 of the CCSL users
manual and the documentation of program BONDS)
Input:
-
The crystal data file must contain all cards needed for structure factor
calculations vis:
-
S cards
giving the symmetry.
A
C card
with the cell dimensions.
A cards
defining the atoms, their positions and isotropic.
temperature factors.
F cards
giving the scattering factors
J cards
describing the multipoles to be used
W ROTN cards
giving the orientation of the multipole axes
and possibly
W RADF cards
giving radial wave-funtions to be used to calculate
the radial form factors
optionally:
-
T cards
giving anisotropic temperature factors
Additionally:
-
L cards
indicating which parameters should be refined
- (see the CCSL users' manual)
I cards
which may have the words words NCYC, CYCL1, PRIN,
MCOR and CONV.
- NCYC the number of least squares cycles (default 3)
CYC1 the number to be assigned to the first cycle (default 1)
PRIN frequency at which output lists are printed
- PRIN = 0 no printing
PRIN = 1 first cycle
PRIN = 2 last cycle
PRIN = 3 first and last cycles
PRIN = 4 every cycle
MCOR controls the correlations printed at tyhe end of the job
- (default +70)
MCOR = 0 whole correlation matrix printed
MCOR = -ve no printing
MCOR = +ve correlations above MCOR printed
CONV convergence criterion; LSQ cycling is terminated if the
- maximum shift/esd < CONV (default 0.01)
One or more data files which should be lists of hkl and observations of the
type and in the format indicated by the values of REFI and MODE. For
single data sets MODE and REFI may be given on an
L card
, but with multiple
data sets they must be given interactively along with the file name. The
relative wieghts to be given to different data sets is also given there.
Output:
-
The usual listing file reporting the data which have been read. This file
also contains the output listings requested by the
I PRIN card
as well as
the R-factors and chisqrd at the end of each least squares cycle.
A new crystal data file corresponding to the structure at the end of the
least squares refinement.
Running the program:
-
On running the program the user is asked for the name of the crystal data
file and the name of the file containing the structure factor data.
The value of \$\chi^2\$ at the end of each cycle is reported on the
terminal.
After the last cycle user is asked for a name for the new crystal data file.
Calls:
- APSHSF
ATOPOS
CALCSF
DFLTMP
GMEQ
INDFIX
LMPCAL
LSETUP
MATCOR
MATINV
MATSET
MATSHF
MATTOT
NOPFIL
NWINSF
ONCARD
OPSYM
PARRUN
PARSSF
PFOUT
PFSET
PREFIN
PRNCYC
RECIP
RELATE
RFACS
SETABS
SETANI
SETFOR
STLSSF
SYMOP
TESTOV
VARMAK
VARSSF
WGHTSF
Common blocks used:
-
- /DERBAS/ to use LVARB
- /DSOURC/ to use NUMSRC JSRC NOBSRC
- /EXTN/ to use IEXTYP CEXT PATHS
- /FCAL/ to use FC
- /IOUNIT/ to use LPT ITO
- /NEWOLD/ to use AMAXSH
- /MPODA/ to use NMPOL
- /NSYM/ to use CENTRC
- /OBSCAL/ to use OBS GCALC DIFF SUMWD WT
- /POSNS/ to use NATOM
- /PRBLEM/ to use NFAM LF1SP
- /REFINE/ to use NCYC NCYC1 LASTCY ICYC MPL CONV
- /RSTATS/ to use RNUM RDEN
- /SFDATA/ to use NDATA HS GOBS WGTS JSCALE CPARS
- /SCLDAT/ to use ISCALE SCALE
- /SCRACH/ to use all members
*** MPLSQ updated for multiple sources C4.1 by PJB December 2006 ***
Classification:
Multipole Form Factors . . . . . . . Main Program
P. Jane Brown
Institut Laue Langevin,
Grenoble, FRANCE