Hello Sir,
I am fitting Cu2O at room temperature. I got the point. So, the negative value of SS parameter is due to the low value of SO2 guessed by artemis. I have done the fitting again by fixing the value of SO2 to 0.7. Now I am gettig positive value of SS parameter which is around 0.007. Please tell me from where I can get the standard value of SO2 calculated theoretically in the literature.
with regards
Abhijeet Gaur
Dear Abhijit,
The parameters So2 and SS are highly correlated. The negative value of SS does not make any physical significance. It may be due that Artemis is conveging for lower value of So2. In your case (So2=0.552 or 0.61) it is very low. Generelly, it should be in the range of 0.7 to 1. It will be better if you fix So2 for the standard value calulated theoretically in the literature or you can try to get approximated value of SS for So2 around 0.8 to 0.9.
regards
Umesh Palikundwar
Department of Physics
RTM Nagpur University,
Nagpur-440033
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Message: 2
Date: Sat, 4 Jul 2009 09:46:28 -0500 (CDT)
From: Carlo Segre <segre@iit.edu>
Subject: Re: [Ifeffit] Re : Cu2O fitting
To: abhijeet gaur <abhijeetgaur9@gmail.com>
Cc: ifeffit@millenia.cars.aps.anl.gov
Message-ID: <alpine.DEB.2.00.0907040943130.4140@hydride>
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Hi Abhijeet:
i think you have to start by looking back at your original data. The
Chi(k) looks very iffy for a crystalline material such as the kind you are
model. Could you send your Athena project with the original data? My
suspicion is that the first peak is mostly due to poor background
subtraction.
Carlo
On Sat, 4 Jul 2009, abhijeet gaur wrote:
> Hi all,
> Thanks for the response. I am sorry as I should attach the figure
> in a viewable format. Anyways now I am attaching a the artemis project file
> in which I had used a set positive value for the SS parameter of first path.
> I am not able to understand the reason for negative SS value.
> Thanks again
> Abhijeet Gaur
>
--
Carlo U. Segre -- Professor of Physics
Associate Dean for Graduate Admissions, Graduate College
Illinois Institute of Technology
Voice: 312.567.3498 Fax: 312.567.3494
segre@iit.edu http://www.iit.edu/~segre segre@debian.org
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