[Ifeffit] Comparison of "amp" between Feff8.40 and feff6 - Curved waves or Plane waves?
Ying Zou
zou at uwm.edu
Thu Aug 28 17:42:12 CDT 2008
Dear all,
While I am calculating FEFF path through Feff8.40 using the "feff8.inp" as attached, I notice that the value of "amp" shown on "FEFF interpretation page" for some paths goes over 100%. For example, path 14 has a Reff=3.9317 far away from first shell, yet it has an "amp"=169.913. On the contrary, if I do the same in Artemis through embedded Feff6.0(using "feff6.inp"), none of paths has an "amp" over 100%. I am guessing this could be all right because Feff8 is using curved waves Feff6 instead plane waves. Any comments on this would be greatly appreciated!
Ying
Ying Zou
Research Assoc., Dr.Phys.
Physics Department, UWM
=======================feff8.inp=======================================
* This feff.inp file generated by ATOMS, version 2.50
* ATOMS written by and copyright (c) Bruce Ravel, 1992-1999
* -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- *
* total mu = 5194.4 cm^-1, delta mu = 761.6 cm^-1
* specific gravity = 7.942, cluster contains 25 atoms.
* -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- *
* mcmaster corrections: 0.00093 ang^2 and 0.165E-05 ang^4
* -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- *
TITLE Perovskite: PbTiO3
EDGE K
S02 1.0
* pot xsph fms paths genfmt ff2chi
CONTROL 1 1 1 1 1 1
PRINT 1 0 0 0 0 3
* r_scf [ l_scf n_scf ca ]
SCF 3.88586 0 15 0.1
* ixc [ Vr Vi ]
EXCHANGE 0 0 0
EXAFS
RPATH 7.77172
* kmax [ delta_k delta_e ]
*XANES 4.0 0.07 0.5
* r_fms [ l_fms ]
*FMS 3.88586 ********
*
*RPATH 0.10000
* emin emax resolution
*LDOS -20 20 0.1
POTENTIALS
* ipot z [ label l_scmt l_fms stoichiometry ]
0 22 Ti -1 -1 0
1 8 O -1 -1 3
2 82 Pb -1 -1 1
3 22 Ti -1 -1 1
ATOMS
0.00000 0.00000 0.00000 0 Ti 0.00000
0.00000 0.00000 -1.76630 1 Oapical 1.76630
1.95250 0.00000 0.32417 1 Oplanar 1.97923
0.00000 -1.95250 0.32417 1 Oplanar 1.97923
-1.95250 0.00000 0.32417 1 Oplanar 1.97923
0.00000 1.95250 0.32417 1 Oplanar 1.97923
0.00000 0.00000 2.38970 1 Oapical 2.38970
-1.95250 -1.95250 1.91592 2 Pb 3.36084
1.95250 -1.95250 1.91592 2 Pb 3.36084
-1.95250 1.95250 1.91592 2 Pb 3.36084
1.95250 1.95250 1.91592 2 Pb 3.36084
1.95250 -1.95250 -2.24008 2 Pb 3.55563
-1.95250 1.95250 -2.24008 2 Pb 3.55563
-1.95250 -1.95250 -2.24008 2 Pb 3.55563
1.95250 1.95250 -2.24008 2 Pb 3.55563
-3.90500 0.00000 0.00000 3 Ti 3.90500
0.00000 3.90500 0.00000 3 Ti 3.90500
3.90500 0.00000 0.00000 3 Ti 3.90500
0.00000 -3.90500 0.00000 3 Ti 3.90500
0.00000 0.00000 4.15600 3 Ti 4.15600
0.00000 0.00000 -4.15600 3 Ti 4.15600
3.90500 0.00000 -1.76630 1 Oapical 4.28589
0.00000 -3.90500 -1.76630 1 Oapical 4.28589
-3.90500 0.00000 -1.76630 1 Oapical 4.28589
0.00000 3.90500 -1.76630 1 Oapical 4.28589
END
============================================================================
========================feff6.inp==========================================
* This feff6 input file was generated by Artemis 0.8.011
* Atoms written by and copyright (c) Bruce Ravel, 1998-2001
* -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- *
* total mu*x=1: 2.06 microns, unit edge step: 13.38 microns
* specific gravity = 7.942
* -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- *
* Normalization correction: 0.00048 ang^2
* -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- * -- *
* -----------------------------------------------------------------
* The following crystallographic data were used:
*
* title Pb Ti O3
* title Glazer A M
* title # Powder profile refinement of lead zirconate titanate at several temperatures.
* title # II. Pure PbTiO3
* title # Locality: synthetic
* title # Sample: T = 25 C
* space = P 4 m m
* a = 3.9050 b = 3.9050 c = 4.1560
* alpha = 90.0 beta = 90.0 gamma = 90.0
* core = Ti edge = K
* atoms
* ! elem x y z tag occ
* Pb 0.00000 0.00000 0.00000 Pb 1.00000
* Ti 0.50000 0.50000 0.53900 Ti 1.00000
* O 0.50000 0.50000 0.11400 Oapical 1.00000
* O 0.50000 0.00000 0.61700 Oplanar 1.00000
* -----------------------------------------------------------------
TITLE Pb Ti O3
TITLE Glazer A M
TITLE # Powder profile refinement of lead zirconate titanate at several temperatures.
TITLE # II. Pure PbTiO3
TITLE # Locality: synthetic
TITLE # Sample: T = 25 C
HOLE 1 1.0 * Ti K edge (4966.0 eV), second number is S0^2
* mphase,mpath,mfeff,mchi
CONTROL 1 1 1 1
PRINT 1 0 0 0
RMAX 4.29550
*CRITERIA curved plane
*DEBYE temp debye-temp
NLEG 4
POTENTIALS
* ipot Z element
0 22 Ti
1 82 Pb
2 22 Ti
3 8 O
ATOMS * this list contains 25 atoms
* x y z ipot tag distance
0.00000 0.00000 0.00000 0 Ti 0.00000
0.00000 0.00000 -1.76630 3 Oapical_1 1.76630
1.95250 0.00000 0.32417 3 Oplanar_1 1.97923
-1.95250 0.00000 0.32417 3 Oplanar_1 1.97923
0.00000 1.95250 0.32417 3 Oplanar_1 1.97923
0.00000 -1.95250 0.32417 3 Oplanar_1 1.97923
0.00000 0.00000 2.38970 3 Oapical_2 2.38970
1.95250 1.95250 1.91592 1 Pb_1 3.36084
-1.95250 1.95250 1.91592 1 Pb_1 3.36084
1.95250 -1.95250 1.91592 1 Pb_1 3.36084
-1.95250 -1.95250 1.91592 1 Pb_1 3.36084
1.95250 1.95250 -2.24008 1 Pb_2 3.55563
-1.95250 1.95250 -2.24008 1 Pb_2 3.55563
1.95250 -1.95250 -2.24008 1 Pb_2 3.55563
-1.95250 -1.95250 -2.24008 1 Pb_2 3.55563
3.90500 0.00000 0.00000 2 Ti_1 3.90500
-3.90500 0.00000 0.00000 2 Ti_1 3.90500
0.00000 3.90500 0.00000 2 Ti_1 3.90500
0.00000 -3.90500 0.00000 2 Ti_1 3.90500
0.00000 0.00000 4.15600 2 Ti_2 4.15600
0.00000 0.00000 -4.15600 2 Ti_2 4.15600
3.90500 0.00000 -1.76630 3 Oapical_3 4.28589
-3.90500 0.00000 -1.76630 3 Oapical_3 4.28589
0.00000 3.90500 -1.76630 3 Oapical_3 4.28589
0.00000 -3.90500 -1.76630 3 Oapical_3 4.28589
END
========================================================================
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