Hi Dariusz,
Just to follow up on Stefan's request to not post large attachments to email:
The ifeffit web page is a wiki, and would be an ideal place for
posting the data (feff inputs, project files, images of plots) for
such questions. You can read up on the wiki page for how to do create
Hi Joseph,
I think this thread may have gone under-noticed, so sorry for not responding.
This seems like a really strange situation (how could Feff be getting
path distances wrong??), but I suspect from your message that you may
have been deliberately playing with the intermediate Feff files and
Hi Joseph,
On Mon, Jun 22, 2009 at 8:15 PM, joseph washington wrote:
> Hi Matt,
> Thanks for your reply. I actually did not diliberately modify the
> intermediate FEFF files.
I think you should probably post the input file.
> Up to this point, I beleive that I've been
> following Bruce's
gt; built diffkk.inp and deltaf.inp files following the instructions given by
> Matt Newville and Julie O. Cross in the Diffkk tutorial. Then, I begin to
> run diffkk in ifeffit 1.2.11c as follows:
>
> ifeffit> run diffkk
> ifeffit> read diffkk.inp
>
> or
> ifeffit>
Hi Folks,
A Post-Doctoral position using XAFS in Earth Sciences is open at St.
Francis Xavier University, working with Alan Anderson.
More details are at http://xafs.org/Jobs
--Matt
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Dear Fiona,
I think it would be pretty unusual for transmission and fluorescence
data measured at the same time to be of comparable quality and both be
"noisy-but-good-enough" that merging would actually help. Are you
sure that the data a similar enough (no pinhole or self-absorption
effects)
I never got one
--Matt
On Tue, Aug 11, 2009 at 1:47 PM, Julie Olmsted Cross wrote:
> I have ten copies of the Athena User Guide leftover from the 2009 APS XAFS
> School. If you want one, send me your mailing address. First come, first
> served.
>
> ~^^~^~^~~^~^~^~^~^~^~^~^~~^~^~
> Dr. Julie
Dear Eugenio,
> I see that the R-factor is pretty good, 1.74%, amp is high cause is
> correlated with the coordination number and always have big errors., delr
> has the error of the total distance, so it is ok, but ss and enot have a a
> really big error, is this normal?
What leads you to
Hi Scott,
> Is this the most recent IXAS report on error reporting standards?
>
> http://www.i-x-s.org/OLD/subcommittee_reports/sc/err-rep.pdf
Yes. To be clear, the main value of reduced chi-square is that it can
be used (even if with some inherent uncertainty) to compare two models
with
Hi Abhijeet,
> I am trying to understand the method of Principal Component Analysis. What
> is PCA, On what principle it works, How it can be applied to system and to
> what type of system it can be applied. I am trying to find the answers of
> these questions. If someone can please tell me
Hi Jan,
You probably need to install the entire Ifeffit perl module (not just
Ifeffit.pm) which should be in a zip file in C:\Program
Files\Ifeffit\build\wrappers\perl
I think you have to unzip this into C:\Perl\, but I'm away from a
machine I can test this on right now (hopefully someone will
Hi Folks,
There have been two post-doc positions posted at http://xafs.org/Jobs
recently. If you know of anyone who might be interested, please pass
these along.
Cheers,
--Matt Newville
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http
Hi Bhoopesh,
It's amazing to me how many people have asked about this data set.
I did not prepare the sample of Fe3C measured for the data in the
model compound library. Basically, a user interested in reduced iron
phases and with good knowledge of carbides showed up at the beamline
with a
gh to notice.
But don't be too surprised if mail to the mailing list takes a bit
longer than usual this afternoon.
Cheers,
--Matt Newville
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Lisa,
I think the issue you're seeing is most likely due to telling athena
to fit the data between E0+199 and E0+200 with a constant. I'd
recommend expanding that range some to give Athena a chance -- if
there isn't any data between E=E0+199 and E0+200, Athena won't be able
to figure out what
Hi Chris,
There is nothing sacred about Rbkg=1.0 Ang. It was chosen as a
reasonable default. If you know you have atoms much closer than 2Ang,
lowering Rbkg to half the first neighbor distance is a fine place to
start. You may have to play with this value (and the k-weight used in
the
Hi Jochen,
Just to follow up on Bruce's response
The short answer is No. Feff8 is hardwired to write to stdout.
Changing that would be a large task. It sounds like you are writing
a script to loop around running Feff8. If so, you can use system
level redirects
feff8 > output.txt
Hi Peter,
Attached is an athena project file with some Sr model compounds. All
data is from SSRL from the mid 1990s, and most uses SrCO3 as a
reference. Some of the data sets are from different runs, and I have
not tried to align the data or standards for these -- these are as
measured.
Hi Lisa,
On Mon, Oct 26, 2009 at 9:12 PM, Gudrun Lisa Bovenkamp
wrote:
> I am sure that Athena was tested a lot, but as Jeremy pointed out, which I
> think now is the answer: If the
> background is substracted before the fitting of the post edge. That is
> actually how we are normalizing
>
Hi Mingliang,
Sorry for the trouble. It's a little hard to tell what's gone wrong,
but here are some hints: The icon to run athena (and others) simply
runs the program "runner.exe" in the Ifeffit "bin" folder (usually
C:\Program Files\Ifeffit\bin). This program sets the path and other
Mingliang,
... but you still have not answered the questions I asked earlier.
I'm willing to try to help, but you are not helping me. Answer those
questions, and try to explain more precisely what you mean by "When
open SixPack" and "open Athena".
--Matt
2009/11/11 康明亮 :
> Dear Matt,
> Many
> would you pls open the enclosure
> and help me to process it? It is only a little workload(Four reference and
> three samples). I just want to know which chemical attribute to the samples,
> FeSe, Se(0), FeSe2 or Se(IV).
No.
--Matt
___
Ifeffit
> I am not mean you need to help me to process them, I just don't know why
> these data can't open in Sixpack or other programm. Is there any problem
> with the raw data? Wish to obtain guidance from you.
I have not looked at the data you sent. Did you expect I would? You
have not answered to
Mingliang,
It's not exactly how I would have liked the answers, but the
screenshots of the steps you performed does actually (at least
implicitly) answer to some of the questions:
1) how are you starting Athena and Sixpack? You never actually said this,
before, bbut you are using
Is there ever a case where a merged reference channel is useful?
I thought the only possible use for a reference channel was for
comparing individual scans. That is, prior to merging.
--Matt
On Thu, Nov 19, 2009 at 6:45 AM, Zajac, Dariusz A.
wrote:
> Dear Bruce, Dear All,
> maybe it is a
Hi Scott
On Thu, Nov 19, 2009 at 9:50 AM, Scott Calvin wrote:
> Hi Matt,
>
> I'm the one who requested the merged reference channel.
>
> If the data is ideal, of course only one reference scan is needed. But there
> are two common ways it can be nonideal that are relevant:
>
> 1) The
Dear Mrs Parsai,
Ifeffit includes tabularized scattering amplitudes and phase shifts
from Feff6, which should be a more accurate than the McKale tables. I
believe that M Vaarkamp, et al, Phys Rev B 50, 117872, 1994 showed
this fairly convincingly.
Admittedly, the format of the Feff tables
Just to follow up a little on Matthew's answer:
The Darwin width is the angular width over which a particular
reflection will diffract. A rocking curve measurement usually leaves
one crystal at a fixed angle and rotates the second crystal. For a
perfectly collimated beam, the resulting
Hi Elizabeth,
If you can install as the user who will run athena/artemis, that
should definitely help. As Bruce suggested, the most likely problem
is that Athena/Artemis are trying to write files to a directory they
do not have permission to write to (hope the grammar police are not
reading
Hi Scott,
I believe we had a conversation about this last January.
XAFS is not sensitive to the crystallographic lattice constants. It
measures the spacing between atoms. Because of thermal vibrations and
other disorder terms, the average distance between atoms is larger
than the distance
Hi Folks,
Prof. Robert Mayanovic at Missouri Sate University is searching for a
post-doctoral associate to work on materials in extreme conditions.
More details are at http://xafs.org/Jobs
--Matt
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Dear Ying,
On Thu, Jan 14, 2010 at 1:00 PM, Ying Zou wrote:
> Dear all,
> One colleague of mine brought up this to my attention. He tried a
> simple Fourier transformation C code on different machines (PowerPC
> based MAC G4, Intel based MAC G5, and PCs). The computations yield
> different
Bruce's guess is correct:
Athena cannot open files with non-ASCII characters in the file or path name.
--Matt
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Hi Bruce,
Was the problem an ifeffit problem -- truncating strings and then not
recognizing them?? If so, what happened?
> P.S. While I am at it, I'll look into the issue of non-ascii
> characters in filenames that Mingliang asked about earlier today.
I think this is an Ifeffit problem.
Dear Rashmi, Vijay, Abhijeet, ,
Can you please ask this question more precisely? Asking for
"guidance" is a bit too vague to expect a helpful answer.
> I am doing some data analysis of XANES as well as EXAFS data using
> data analysis software SIXPack. I am not able to load any data file.
> Thanks for your suggestions. Actually sometimes we are not
> able to frame the question correctly, which is also one of the reason of not
> getting a response.
The issue is not so much framing a question correctly, but asking a
question that can be answered.
> To be
On Sat, Feb 13, 2010 at 10:38 AM, Frenkel, Anatoly wrote:
> Can't wait for a question in Russian.
> Anatoly
Как объясните самопоглощение в русском?
--Matt
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On Sat, Feb 13, 2010 at 10:59 AM, Scott Calvin wrote:
> You'll probably get Russian before I get Latin.
Quam utor postulo notitia quinymo quam Feff ut a vexillum in Artemis?
But you're right: Russian did come before Latin ;)
--Matt
___
Ifeffit
David,
I suspect that you *should* get sensible error messages from Athena
about running out of Ifeffit resources well before seeing a crash of
X. Not in the sense of "Bruce ought to change Athena to report
this", but in the sense of "Bruce already does report this".
Generally, Ifeffit/Athena
Hi David,
Do you (or can you) see such issues with other applications? I would
probably first try /usr/bin/widget, the Perl/Tk demo code (I think
that should be installed with the debian package), to see if that
ever has the same problem. I might try re-installing (or even
rebuilding from
Hi Thorsten,
Thorsten Bartels-Rausch wrote:
> Hi Matt
>
> thanks for the ifeffit software package that we also use here at the
> Swiss Light Source (PSI SLS). May
> I kindly ask, if you have a binary version of the package that runs under Os
> X 10.6 Snow Leopard (64 bit)?
> Or should I
Thanks Mauro!
--Matt
On Sat, Feb 20, 2010 at 3:03 AM, Mauro Rovezzi wrote:
> Dear all,
>
> A short off-topic message to inform you that I have subscribed (in
> accord with Matt) the Ifeffit mailing-list to the http://gmane.org
> archive. This will permit to follow this (traffic-growing)
Hi David,
There is no explicit protection for disk access to prevent i/o
conflicts between different applications (and nothing specific to NFS
or other networked drives), but disk access is relatively rare and
reasonably well encapsulated.
So, yes there are "potential problems", though I don't
Hi Alexander,
I see two issues with these data files that are probably tripping up Athena:
First: the files end with an "END OF DATA" line. This is a fine
choice for how to organize a data file, but it's not what Ifeffit is
expecting.
Second: a bigger issue is that there isn't a column for
Dear Maria,
If you haven't already done so, I would suggest that you begin by
separately fitting the data for each edge on each sample. This will
give you a good understanding of the local structure around each metal
ion. Once you have this intimacy with the structural models, you
will be able
Hi Folks,
The APS networking people will be doing some hardware work next week
which means that millenia.cars.aps.anl.gov will be inaccessible to the
outside world May 10,11,12, and 17. Because of this, xafs.org, the
Ifeffit wiki, and this mailing list will all appear to be down on
these days.
Hi Kleber,
> I'd like to use the third cumulant option in Artemis, but considering the
> Debye model. Artemis has a Debye function for the second cumulant
> (Debye-Waller factor) but not to the third. How could this be done in
> Artemis?
The debye and eins functions in Artemis/Ifeffit calculates
ggested min/max idiom.
>
> I like better the idea of penalizing a fit when percap is outside of a
> defined range and thus "encouraging" the fit to settle percap somewhere
> inside this range. But in trying to use the restraint idea, including the
> fix suggested by Matt Newvill
> By default, Athena smooths derivative data three times before plotting it.
> This is controlled by the plot->smoothderiv parameter (which can be set in
> the preferences dialog under the Setting menu).
>
> When you export the derivative data, it is not smoothed. So, to reproduce
> Athena's plot
Hi Chris,
On Mon, Jun 28, 2010 at 3:10 PM, Chris Patridge wrote:
> Hello all,
>
> I am working on W L3 edge data. W is acting as a substitution dopant in
> vanadium dioxide at rather low concentration. In a past mailing
> conversation discussing Feff6 overestimation of E0 for heavier elements
Dear Varadarian,
I didn't look at your attachments, but have you considered that there
might be some Cd-Ca in the second shell? I didn't see what value of
x you had in Cd(1-x)CaxO, but if the oxides form a solid solution one
might naively expect the second shell to have (1-x) Cd and x Ca
Dear Rana,
Delta E0 is a shift in the Energy origin of k, that is where k=0. For
the experimental data, this was chosen empirically (and so somewhat
arbitrarily) from the measured data. For the FEFF calculation, it was
chosen at the calculated absorption threshold (lowest available
electronic
Hi Todd,
On Mon, Jul 26, 2010 at 3:39 PM, Monson, Todd wrote:
> On Saturday, while starting up Athena, I was informed that there was an
> update to Athena available. I tried installing the update but failed. I am
> afraid this is due to some user permission issue in windows 7. How can I
> try
Hi Todd,
That sounds like a permissions problem to me. Some account needs to
be able to write to that file
If updating the updater.ini file is not working, and Laurent's
suggestions don't let you edit that file, you could also try
downloading and installing the update zip files by hand.
Yes, Athena, Artemis, Hephaestus, Artemis, and SixPack all run fine
on Windows 7. Even 64bit Windows7. Even on a Mac running Parallels.
--Matt
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Hi Joel,
Sorry that Python scripting is not currently included in the iXAFS
installation or easily available on Mac OS X. I'll work on this and
post it as soon as possible. I am just getting back to having a Mac
with a build system, so it might take me a little time.
For windows, there is
Hi Joel,
I updated the Ifeffit-Python extension for Windows, and have put it at:
http://cars9.uchicago.edu/ifeffit/Python
This requires a working windows installation of Ifeffit+, but it does
work on a Mac running Parallels. I've only tested the Python
extension with Python2.6, but I
Hi Aranwela,
Thanks for the report. I do think this is a permissions problem.
That's not to say it's not a real problem, just that it should be
solvable. I just tested this by resetting the "update level" in
config/current.dat, and forcing the updater to run. It worked fine to
download and
Rana,
Yes, see
http://millenia.cars.aps.anl.gov/pipermail/ifeffit/2006-September/007204.html
for details.
--Matt
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quot;credits" or "license" for more information.
>>> import Ifeffit
>>> iff = Ifeffit.Ifeffit()
>>> iff.ifeffit('show $&build')
$&build= 1.2.11c Copyright (c) 2008 Matt Newville, Univ of Chicago
0
>>> import numpy
>>> x = nu
Hi,
I have made a little progress understanding and getting Ken McIvor's
iXAFS build scripts to run on my Macbook Pro. I have not yet tackled
a full 64-bit version, but have managed to get it to compile ifeffit
1.2.11c and everything up to horae, including Tk and PGPLOT.
I could not get
op me complaining about perl.
OK, that was a half a day Now back to OS X and trying to build
perl and horae there...
--Matt
On Tue, Aug 31, 2010 at 10:07 AM, Bruce Ravel wrote:
> On Tuesday 31 August 2010 10:42:02 am Matt Newville wrote:
>> I could also not get horae-070 to bui
Hi Folks,
With help from Ken McIvor and Jeff Terry, I've built a new version of
iXAFS for Mac OS X. This version should be considered experimental,
but for the brave and/or foolhardy please try it out and let us know
how it works. This version offers the latest versions of Athena,
Artemis, and
Sorry for the typo. The download is at
http://cars9.uchicago.edu/~ifeffit/src/iXAFS3.0.dmg
--Matt
On Fri, Sep 3, 2010 at 10:08 PM, Matt Newville
wrote:
> Hi Folks,
>
> With help from Ken McIvor and Jeff Terry, I've built a new version of
> iXAFS for Mac OS X. This
Hi Joel, All,
Yes, sorry for that. I'm still learning how to do this. Here's the
latest news (some progress, incomplete):
With Jeff's earlier message I looked into and solved at least one of
the problems: that /Users/Newville/Codes/ifeffit/local/bin/perl
was all over the place and expected.
appreciated.
Cheers,
--Matt
On Mon, Sep 6, 2010 at 11:06 AM, Jeff Terry wrote:
> Hi All,
>
> Looks like it works now on intel machines..
> I can run ifeffit from the iXAFS shell.
>
> The iXAFS app is not universal though, it is Intel only.
>
> Nice job Matt.
>
> Jef
For kicks I also tried 'arch -x86_64 ifeffit' and got the error
> 'arch: posix_spawnp: ifeffit: Bad CPU type in executable'. Let me know if
> there is any other information that I can provide you with.
>
> Thanks again
> Brandon
>
> On Tue, Sep 7, 2010 at 2
till have '.
> /Applications/iXAFS.app/Contents/Resources/local/bin/iff_init.sh' in my
> '.profile'. Do I need to keep this? If so, it would be nice to fix
> iff_init.sh too :-)
>
> Thanks,
>
> Joel + Barb
>
> ____
&
Hi Mohamed,
I'm not certain I understand what you're trying to do, but to add a
"dopant" or partial occupancy of an atom at a particular lattice site,
run atoms on the "pure" structure (UO2) and then replace some of the
"solvant" (U) with the "solute" (Ce) in the feff.inp. See
Hi Juan,
On Fri, Sep 10, 2010 at 7:29 PM, Lezama Pacheco, Juan Salvador
wrote:
> Reposting, just notice no line breaks, sorry!
> Juan
> Dear All:
> First of all, nicely done you guys! This is indeed
> a set great of tools the community really appreciates
> it and I have been putting into heavy
Hi Juan,
The data and model are k-weighted and multiplied by the chosen window
function before the least-squares fit. So yes, as you see, the choice
of dk will change a k-space fit. I wouldn't expect it to change the
results by a huge amount no matter how the fit was done. I would
suspect
Hi Josh,
That cpan command should be done from the horae install directory. Saying
perl -MCPAN -e 'install Bundle::XXX'
is looking for the file named XXX.pm (which simply contains a list of
Perl modules)
in the directory Bundle/. I think that if it can't find that, then
it goes to look
Hi All,
OK, sorry for the delay, but I think that
http://cars9.uchicago.edu/~ifeffit/src/iXAFS3.0.3.dmg
should now work well for both Mac OS X 10.6 and 10.5. That is, all
the applications launch for me on a 10.6.5 machine and a 10.5.8
machine, and seem to work as expected. I'll try this on
Hi Josh,
> Hi Matt,
> Thanks for the quick response. I did run the command from within the horae
> install directory, and the file XasPerlBundle.pm is in the Bundle directory,
> i.e.,
>
> verrocchio.phys #] pwd
> /tmp/horae-070
> verrocchio.phys #] ls
> . Bundle INSTALL aug
Type "help", "copyright", "credits" or "license" for more information.
>>> import Ifeffit
>>> i = Ifeffit.Ifeffit()
>>> i.ifeffit("show $&build")
$&build= 1.2.12 Copyright (c) 2005 Matt Newville, Uni
Dear Elsa,
It sounds like you want to adjust the data chi(k) so that deltaE0 is 0
in a fit. Is that correct, or are you trying to do something else
(say, align the XANES)?If that assumption is correct, you want to
change the E0 used to extract chi(k) from the experimental spectra --
the E0
Hi Elsa,
On Thu, Sep 30, 2010 at 10:33 AM, Elsa Sileo wrote:
>
> Dear Matt,
>
> I have to perform EXAFS analysis, and when I tried to fit the first
> shell, I found deltaE0 values of about 8 eV. Following the paper of
> Kelly et al (Analysis of soils and minerals using X-ray absorption
>
Dear Jatin,
I tried to answer both of these question in chapter 3 of
http://xafs.org/Tutorials?action=AttachFile&do=view&target=Newville_xas_fundamentals.pdf
Does the explanation there help? If not, do you have any suggestions
for making it clearer?
The basic physics is that an absorbed
Dear Ornel,
Alignment here means to make sure that the energy scale has not
drifted between different scans. At many (especially older)
facilities, it is not too unusual to have the apparent energy scale
drift around a bit over time.
Sometimes a reference sample is measured simultaneously
Hi Scott,
That's a pretty amazing use case.
But I'm not sure I understand the issue exactly right. I would have
thought the volume (r**3) was the important physical parameter, and
that a 1000nm particle would dominate the spectra over 3nm particles.
Or is it that you are trying to
Hi George,
Feff6 comes built in with the Mac distributions of Ifeffit
(iXAFS.app), and is at
/Applications/iXAFS.app/Contents/Resources/local/bin/feff6.
Is that OK or do you really need Feff7? There's not much in Feff7
that's not in Feff6 (or a whole lot better in Feff8).
FWIW, that version was
Hi Andrew,
On Mon, Nov 1, 2010 at 12:01 PM, Andrew Korinda
wrote:
> I'm looking to introduce some scripting routines to some of my EXAFS
> fitting work. Looking around I ran across the Python module and
> downloaded that. The shell works fine, as does enter commands directly
> into Ifeffit,
Hi George,
On Wed, Nov 3, 2010 at 2:07 PM, George Sterbinsky
wrote:
> Is it possible that I need to download and install the gfortran-4.2.3.dmg
> file in addition to gfortran-42-5577.pkg file? Any suggestions as to what to
> try would be appreciated.
I doubt it.
>> It took me some time to
Hi George,
On Wed, Nov 3, 2010 at 2:37 PM, George Sterbinsky
wrote:
> I've also noticed that there is not a file or directory called gfortran in
> '/usr/local/bin'. This is what made me think I may also need to install the
> gfortran-4.2.3.dmg file. If I do not see a file or directory called
Hi Aaron,
If you're having troubles with the updater, I would suggest:
re-installing and then say No to the automated "shall I update for
you?".See
http://cars9.uchicago.edu/ifeffit/IfeffitOnWindows/RunnerProgram
and
http://cars9.uchicago.edu/ifeffit/IfeffitOnWindows/WinUpdater
It's a term taken from x-ray fluorescence spectroscopy, or probably
really any fluorescence spectroscopy, where it has very sensible
meaning: the attenuation of the fluorescence signal by the sample
itself. I would even say it is used "mostly correctly" in XAFS, or at
least with a similar intent
Dear Jatin,
The idea that the optimum absorption length (mu*t) for transmission
experiments is 2.3 assumes that the errors in the measurement are due
to counting statistics of the x-rays. For any synchrotron experiment,
the number of x-rays in the transmission chamber is high enough that
the
Scott,
I agree with Jeremy and Matthew. Layering very small (compared to an
absorption length) spheres is exactly what "powder on tape" and mixing
with a low-Z binder do, and that's why these are the preferred methods
for turning a powder into a sample of uniform thickness. If the
spheres are
Hi Edmund,
Thanks for that post... I'd never seen the UV-vis literature on this
and didn't know what a Ringbom plot was. A google search led to
Ramirez-Munoz 1967 (doi:10.1016/0026-265X(67)90042-2) on
Atomic-Absorption Photometry, which shows a very nice result that
significant distortions
On Mon, Nov 22, 2010 at 4:55 PM, Scott Calvin wrote:
> Some follow-up.
> This, for example, is from an excellent workshop presentation by Rob
> Scarrow:
>
> Errors from large particles are independent of thickness
Yes... one can have a sample that is uniform, or made of small
particles, and
Hi Yuan, Bruce,
It looks like I need to make a dll with more than 512 paths. I'm
on this, but it might take me a day or so.
--Matt
On Mon, Nov 22, 2010 at 5:09 PM, Bruce Ravel wrote:
>
> Yuan,
>
> It seems unwise to post a new question at the end of a long and active
> thread. Presumably
Yuan, All,
I put several Windows dlls for Ifeffit at
http://cars9.uchicago.edu/~ifeffit/src/Win32_dlls/1.2.12/
There are versions there with 256, 512, 1024, and 2048 paths.I
have not tested these beyond loading them, and running a trivial
python script. Please let me know if there are
Scott,
> OK, I've got it straight now. The answer is yes, the distortion from
> nonuniformity is as bad for four strips stacked as for the single strip.
I don't think that's correct.
> This is surprising to me, but the mathematics is fairly clear. Stacking
> multiple layers of tape rather than
Scott,
You said:
> the distortion from nonuniformity is as bad for four strips
> stacked as for the single strip.
As I showed earlier, a four layer sample is more uniform than a one
layer sample, whether the total thickness is preserved or the
thickness per layer is preserved.
> For 1%
0.099 |
>> # 5 | 1.0 | 4.950 | 0.225 |
>> # 25 | 1.0 | 24.750 | 0.500 |
>>
>> As before, the standard deviation increases as square root of
>> N. Using a cumulant expansion (admittedly slightly funky
Hi Jeremy, Anatoly,
Thanks, you're absolutely right -- I got the parentheses wrong.
Anatoly,
> However, thickness is present in mu*t only because of the total number of
> absorbers. There are 1/2 absorbers in
> the foil with 50% holes, and thus (t*mu)_measured is equal to (1/2) *
>
Scott,
> Let me try again.
I think I understand you now, and I think I agree completely.
> First of all, perhaps you missed that after my first post, I acknowledged
> that my statement in the first post was mistaken? In fact, I later said:
>
>> So there's nothing wrong with the arguments in Lu
Hi George,
The 'About' screen didn't get changed. I did very little to Jeff and
Ken's "outer Cocoa layer". I'll try to fix that, but it's probably
not worth a new install. The main thing to check is whether Athena is
the right version (0.8.061).
Like Jeff said, iXAFS 2 and 3 do nothing to
Dear Qingyu,
I haven't analyzed this data carefully, but attached is an Athena
Project File of some room temperature data on W metal from a
powder-on-tape sample, Si(111) mono, W L3 edge, APS bending magnet
line. I don't have ready details on the absolute calibration, but
the edge energy is
fit
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