Jatin,<br><br>If these changes are systematic and you somewhat understand the physical or chemical process associated with the sample,  then why not just build a model and do a structural fitting?    A simple peak ratio comparison maybe helpful but a much stronger argument and interpretation can be made if you use a structural model to extract these comparisons.... <br>
<br>several methods for building a model are available.<br><br>buena salud,<br><br>Chris Patridge<br><br><div class="gmail_quote">On Wed, Sep 5, 2012 at 8:01 AM, Rana, Jatinkumar Kantilal <span dir="ltr">&lt;<a href="mailto:jatinkumar.rana@helmholtz-berlin.de" target="_blank">jatinkumar.rana@helmholtz-berlin.de</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">




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<p class="MsoNormal">Dear Ifeffit community,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span lang="EN-US">I was wondering If I can make a qualitative comparison about the amplitude ratio of first two shells for various states of same sample ?</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">For example, I have a sample which is measured at various states, say A, B, C, D and E during any physical or chemical process.
</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">I get systematic change in the ratio of first two peaks at each state. This could be interpreted either as change in disorder or as change in number of atoms associated with first two shells as a result of any physical
 or chemical change material has undergone. </span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">As we know that amplitude of peak decreases with increase in distance from central absorber.
</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Can I compare the amplitude ratio of first two peaks for various states of same sample ??</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Many thanks in advance !!!</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">With best regards,</span></p>
<p class="MsoNormal"><span lang="EN-US">Jatin</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
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