[Ifeffit] Ifeffit Digest, Vol 78, Issue 23

[Liu Lei]

Hello,I will cancel the booking.
Best Regards!


    
ifeffit-request at millenia.cars.aps.anl.gov 写:

> Send Ifeffit mailing list submissions to
> 	ifeffit at millenia.cars.aps.anl.gov
> 
> To subscribe or unsubscribe via the World Wide Web, visit
> 	http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
> or, via email, send a message with subject or body 'help' to
> 	ifeffit-request at millenia.cars.aps.anl.gov
> 
> You can reach the person managing the list at
> 	ifeffit-owner at millenia.cars.aps.anl.gov
> 
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Ifeffit digest..."
> 
> 
> Today's Topics:
> 
>    1. Re: Vanadium pre edge peak contributes to K-space? (Bruce Ravel)
>    2. Re: Vanadium pre edge peak contributes to K-space?
>       (Chris Patridge)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Tue, 25 Aug 2009 11:32:41 -0400
> From: Bruce Ravel <bravel at bnl.gov>
> Subject: Re: [Ifeffit] Vanadium pre edge peak contributes to K-space?
> To: XAFS Analysis using Ifeffit <ifeffit at millenia.cars.aps.anl.gov>
> Message-ID: <200908251132.41271.bravel at bnl.gov>
> Content-Type: text/plain;  charset="iso-8859-1"
> 
> On Tuesday 25 August 2009 11:02:26 am Chris Patridge wrote:
>> Hello all,
>>
>> After calibration, alignment and merging V K edge data, there seems to
>> be a large peak in R space below 1 A.  From most examples and readings,
>> this would seem to be noise since atoms do not reside that close to each
>> other.  Adding a background addresses this noise but then the number of
>> variables becomes too large and meaningless to the first shell R space
>> range.  I believe the problem lies with the large pre edge feature seen
>> with high valence state Vanadium compounds.  Any suggestions on how to
>> work through this and make realistic EXAFS analysis on these compounds.
>>
>> Thanks everyone,
> 
> 
> Didn't Richard Mayes answer this same question from you last month?
> 
>    http://millenia.cars.aps.anl.gov/pipermail/ifeffit/2009-July/004365.html
> 
> In my experience, Richard's answer was spot on for V K edge data.
> 
> If Richard's good advice didn't help, then you need to be more
> explicit about what the problem is, perhaps by posting a small athena
> project file that demonstrates the problem.
> 
> B
> 
> 
> -- 
> 
>  Bruce Ravel  ------------------------------------ bravel at bnl.gov
> 
>  National Institute of Standards and Technology
>  Synchrotron Methods Group at NSLS --- Beamlines U7A, X24A, X23A2
>  Building 535A
>  Upton NY, 11973
> 
>  My homepage:    http://xafs.org/BruceRavel
>  EXAFS software: http://cars9.uchicago.edu/~ravel/software/exafs/
> 
> 
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Tue, 25 Aug 2009 11:44:38 -0400
> From: Chris Patridge <patridge at buffalo.edu>
> Subject: Re: [Ifeffit] Vanadium pre edge peak contributes to K-space?
> To: XAFS Analysis using Ifeffit <ifeffit at millenia.cars.aps.anl.gov>
> Message-ID: <4A9406E6.9070808 at buffalo.edu>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Bruce Ravel wrote:
>> On Tuesday 25 August 2009 11:02:26 am Chris Patridge wrote:
>>   
>>> Hello all,
>>>
>>> After calibration, alignment and merging V K edge data, there seems to
>>> be a large peak in R space below 1 A.  From most examples and readings,
>>> this would seem to be noise since atoms do not reside that close to each
>>> other.  Adding a background addresses this noise but then the number of
>>> variables becomes too large and meaningless to the first shell R space
>>> range.  I believe the problem lies with the large pre edge feature seen
>>> with high valence state Vanadium compounds.  Any suggestions on how to
>>> work through this and make realistic EXAFS analysis on these compounds.
>>>
>>> Thanks everyone,
>>>     
>>
>>
>> Didn't Richard Mayes answer this same question from you last month?
>>
>>    http://millenia.cars.aps.anl.gov/pipermail/ifeffit/2009-July/004365.html
>>
>> In my experience, Richard's answer was spot on for V K edge data.
>>
>> If Richard's good advice didn't help, then you need to be more
>> explicit about what the problem is, perhaps by posting a small athena
>> project file that demonstrates the problem.
>>
>> B
>>
>>
>>   
> Yes it is a very similar question.  I did make this type of correction 
> by setting E0 myself.  When moving to R space the data shows significant 
> intensity below 1 A which I thought was noise but it may not be.  Are 
> these low A signals data or noise is my main concern because EXAFS 
> fitting does not fit all that well which then would point me to my model 
> as the problem which I think i understand.
> 
> Thank you all for your patience,
> 
> -- 
> Christopher J. Patridge
> Graduate Student
> SUNY Buffalo - Dept of Chemistry
> 716-645-6800 x 2110
> 315-529-0501
> 
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: http://millenia.cars.aps.anl.gov/pipermail/ifeffit/attachments/20090825/
47471917/attachment-0001.html 
> 
> ------------------------------
> 
> _______________________________________________
> Ifeffit mailing list
> Ifeffit at millenia.cars.aps.anl.gov
> http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
> 
> 
> End of Ifeffit Digest, Vol 78, Issue 23
> ***************************************