Re: [Ifeffit] Amplitude in Artemis

Dear Paul: If you could give us more detail about the model, it might help us interpret the amp>1 question. What is needed is the following what is the data of? what is the structural model you are using? an Artemis project file could also help. Cheers, Carlo On Mon, 27 Feb 2006, Paul wrote:

Uncertainty can get fairly close to 0 (+/- 0.1) but amp gets up anywhere from 2 to 4 depending on what data set I'm fitting to.

----- Original Message ----- From: "Scott Calvin" To: "XAFS Analysis using Ifeffit" Cc: Sent: Monday, February 27, 2006 10:56 AM Subject: Re: [Ifeffit] Amplitude in Artemis

...

How far above 1? And with what uncertainty?

--Scott Calvin Sarah Lawrence College

At 07:52 PM 2/26/2006, you wrote:

...

I have just started a PhD and have been given alot of EXAFS data to simulate but I don't know much about artemis. I have tried to fit the data for quite some time now, but can't get any kind of good fit unless the amplitude is above 1. Is there any way amp can be above 1 and rationally explained?

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-- Carlo U. Segre -- Professor of Physics Associate Dean for Special Projects, Graduate College Illinois Institute of Technology Voice: 312.567.3498 Fax: 312.567.3494 Carlo.Segre@iit.edu http://www.iit.edu/~segre