Dear Alexey,
Yes it certainly helped. I was almost on the correct lines but was not
completely aware of the ion chamber consideration. I will check the values
for amplification and will take the proper values into the consideration.
Sincerely yours
Pushkar
On Mon, Feb 27, 2017 at 3:53 PM,
Dear Pushkar,
1) µ is the total absorption at a given energy. If you are above the edge,
it will be higher than if you are below. Test it by changing the energy.
NOTE that the absorption value you have in Athena is calculated form the
ion chamber values, which are amplified. If I2 is amplified
Dear Alexey,
Thank you for your insightful suggestions and very useful
information. Now that I have got the XAFSmass program running (?) it is
giving me some values and no more error. So I am assuming that I am doing
everything right. However, I still have some questions regarding the
Dear Pushkar,
1) M%x is the mass percentage.
2) This function is for calculating the element concentration from the
absorption spectrum. XAFSmass does not have problems with long formulas.
You wrote the formula correctly, but maybe you did not indicate also the
total absorption, edge jump with
Thank you, Alexey, for very useful information. Currently, I am working on
XAFSmass. Technically it looks much more flexible than the software
provided by SPring-8 since almost all the variables can be changed and
adjusted as per the requirements.
1) However, sample information is very tedious to
Dear Pushkar,
regarding your last question: the absorption edge jump (Delta µd) is the
difference in absorption before the edge and after the edge, e.g. Pt
L3-edge is at 11564 eV, so Delta(µd) = µd at 11580 eV - µd at 11550 eV. The
total absorption (µd) takes all atoms into account. You only need
Thank you, Bruce and Alexey for your kind information.
Bruce the communication, unfortunately, is not available on our Internet
connection from university to download for free. Do you think it would be
possible (under the copyrights act off course) for you send a PDF copy? The
communication seems
This might help: https://doi.org/10.1107/S1600577514001283
Note that we measured a sequence of standards of known thickness and
concentration /prior/ to the rest of the experiment, so the methodology
in that paper might not be useful after the fact in the absence of that
prep work.
B
On
Dear Pushkar,
in the X-ray data booklet (online version http://xdb.lbl.gov/xdb.pdf), see
"Section 1.6 MASS ABSORPTION COEFFICIENTS" for the explanation and a
reference to absorption coefficient tables in literature.
I personally like the empirical way, i.e. comparison to well-known standard
Dear All,
First of all, is it possible to calculate the concentration of metal
(loading, therefore) from just the edge jump? Is there a simpler equation
like knowing the Flux values or some basic instrumental information we can
calculate the concentration term using Io and It values of
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