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<DIV>Pedro,</DIV>
<DIV>I believe you can learn a lot from Bruce's video lectures, see <A
href="http://www.diamond.ac.uk/Beamlines/Spectroscopy/Techniques/XAS.html">http://www.diamond.ac.uk/Beamlines/Spectroscopy/Techniques/XAS.html</A></DIV>
<DIV>The peak at 1A is due to your improper background removal. After you see
Bruce's lectures, you will be one step closer to be an XAFS expert.</DIV>
<DIV> </DIV>
<DIV>Good luck!</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana; COLOR: #c0c0c0"
align=left>2015-09-24
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<DIV><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: Calibri; COLOR: #000000">Guanghui</SPAN></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></STATIONERY></SPAN></DIV>
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<DIV><STRONG>发件人：</STRONG>Pedro F B D Martins
<pedrofbdmartins@gmail.com></DIV>
<DIV><STRONG>发送时间：</STRONG>2015-09-23 22:12</DIV>
<DIV><STRONG>主题：</STRONG>Re: [Ifeffit] Problems during copper (II) oxide data
treatment</DIV>
<DIV><STRONG>收件人：</STRONG>"Ifeffit Mail
List"<ifeffit@millenia.cars.aps.anl.gov></DIV>
<DIV><STRONG>抄送：</STRONG></DIV>
<DIV> </DIV>
<DIV>
<DIV dir=ltr>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: arial,helvetica,sans-serif">Here follow
the data (please find attached).</DIV></DIV>
<DIV class=gmail_extra><BR>
<DIV class=gmail_quote>2015-09-23 23:46 GMT-03:00 Pedro F B D Martins <SPAN
dir=ltr><<A href="mailto:pedrofbdmartins@gmail.com"
target=_blank>pedrofbdmartins@gmail.com</A>></SPAN>:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex">
<DIV dir=ltr>
<DIV class=gmail_default>
<P class=MsoNormal><SPAN lang=EN-US style="LINE-HEIGHT: 107%"><FONT
face="arial, helvetica, sans-serif">Hi everyone, I’m having problems during
the data treatment. The two samples (please find the project attached with the
as-obtained data only, not with the following treatment) are of CuO (copper
(II) oxide) were measured in a row and both were measured together with a
reference (Cu foil). I have some doubts:</FONT></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%"><SPAN
style="LINE-HEIGHT: normal; font-stretch: normal"><BR></SPAN></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%"><SPAN
style="LINE-HEIGHT: normal; font-stretch: normal">1) </SPAN></SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%">The first
thing that I did was to calibrate the Reference of the first measurement (peak
at maximum of first derivative). Next, I aligned the second Reference keeping
the first reference as standard. Did I do correctly until now?</SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%"><SPAN
style="LINE-HEIGHT: normal; font-stretch: normal"><BR></SPAN></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%"><SPAN
style="LINE-HEIGHT: normal; font-stretch: normal">2) </SPAN></SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%">I removed
the glitches that appeared in the pre-edge (1 glitch) and the EXAFS region (3
glitches) in both measurements.</SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%"><SPAN
style="LINE-HEIGHT: normal; font-stretch: normal"><BR></SPAN></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%"><SPAN
style="LINE-HEIGHT: normal; font-stretch: normal">3) </SPAN></SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%">Next, I set
the E0 for both samples in the background removal session to set the 0 (zero)
point in chi(k). However, when I plot chi(k) the samples profile in high k
values differ. I think that they should be at least very close considering
that both are the same copper oxide standard and measured in sequence. Am I
correct?</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%"><BR></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%">4) I've
also noticed that the first measurement (Cu_o_2), when plot in chi(R) has a
small (but </SPAN><SPAN
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 17px">significant</SPAN><SPAN
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%">) peak
positioned at R = 1, which seems not be right, as bond distances are
bigger (> 1.5, for example). Is there anything wrong or missing at
background removal treatment?</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%"><BR></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: arial,helvetica,sans-serif; LINE-HEIGHT: 107%">I know that
it seems novice doubts but as I’m new to XAFS, it really intrigues
me.</SPAN></P>
<P><SPAN lang=EN-US style="LINE-HEIGHT: 107%"><FONT
face="arial, helvetica, sans-serif"></FONT></SPAN> </P>
<P><SPAN lang=EN-US style="LINE-HEIGHT: 107%"><FONT
face="arial, helvetica, sans-serif">Best regards,</FONT></SPAN></P>
<P><SPAN lang=EN-US style="LINE-HEIGHT: 107%"><FONT
face="arial, helvetica, sans-serif">Pedro Martins</FONT><FONT
style="FONT-SIZE: 12pt"
face="Times New Roman, serif"></FONT></SPAN></P></DIV></DIV></BLOCKQUOTE></DIV><BR></DIV></DIV></DIV></BODY></HTML>