[Ifeffit] Fitting Commercial Molybdenum Disulfide
dmc at pdx.edu
dmc at pdx.edu
Fri Oct 29 12:24:38 CDT 2004
Dear List,
Thanks for all the good suggestions. Here's how my fit stands at this
point. I have a few multiple scattering paths at 3.989, in order to excude
these 2 I put the R-range from 1-3.975. It seems that you think I should
include these paths, if so, do I treat them a little differently. They don't
seem to help the fit using the same parameter strategy. Additionally, I
extended the k-range from 2-13.5 to 2-15. This seemed to improve the reduced
chi-square dramatically.
Thanks Again, Dan
One Eo, seperate ss's, seperate Delr's, expanded k, R ranges:
Independent points = 24.281250000
Number of variables = 7.000000000
Chi-square = 6436.437226455
Reduced Chi-square = 372.452063737
R-factor = 0.047313433
Measurement uncertainty (k) = 0.000187262
Measurement uncertainty (R) = 0.006509968
Number of data sets = 1.000000000
Guess parameters +/- uncertainties (initial guess):
ss = 0.0041180 +/- 0.0005120 (guessed as 0.004636
(0.000411))
e0 = 0.8351420 +/- 1.1214120 (guessed as 1.765958
(1.154388))
alpha = -0.0012160 +/- 0.0030000 (guessed as 0.001090
(0.002843))
ss2 = 0.0044650 +/- 0.0004590 (0.0000)
ss3 = 0.0284980 +/- 0.0234700 (0.0000)
alpha2 = 0.0070700 +/- 0.0020190 (0.0000)
alpha3 = -0.0267670 +/- 0.0318320 (0.0000)
Def parameters:
delr_1 = -0.0048260
delr_2 = 0.0280560
delr_3 = -0.1062180
Set parameters:
amp = 0.7
Correlations between variables:
e0 and alpha --> 0.8148
e0 and alpha2 --> 0.6596
alpha and alpha2 --> 0.5393
ss3 and alpha3 --> 0.3825
e0 and alpha3 --> -0.2940
All other correlations are below 0.25
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