It's a term taken from x-ray fluorescence spectroscopy, or probably
really any fluorescence spectroscopy, where it has very sensible
meaning: the attenuation of the fluorescence signal by the sample
itself. I would even say it is used "mostly correctly" in XAFS, or at
least with a similar intent as the original term, much as the term
Debye-Waller Factor is used.
--Matt
On Tue, Nov 16, 2010 at 1:01 PM, Scott Calvin
I tried a few searches, but rapidly get lost in other uses of the term. My guess is we borrowed it from some other spectroscopy, much the way we borrowed "Debye-Waller factor" from XRD, and then proceeded to change its meaning. But it would be nice to be able to track that down.
--Scott Calvin Faculty at Sarah Lawrence College Currently on sabbatical at Stanford Synchrotron Radiation Laboratory
On Nov 16, 2010, at 10:54 AM, Matthew Marcus wrote:
It's definitely a misnomer. I use "overabsorption" and encourage others to do so. I suppose to track it down would require going back over the seminal papers on the subject. mam
On 11/16/2010 10:19 AM, Scott Calvin wrote:
Hi all,
As some of you know, I'm currently working on a textbook on XAFS analysis. Because of that, I'm going to occasionally pose some questions for the list that may seem a bit random. I hope none of you mind me using the list in this way; the questions may seem to come out of left field, but I think they will still be of interest to many.
With that said, here's my question for today:
What is the origin of the use of "self-absorption" to describe the suppression of fine-structure observed in thick, concentrated samples measured in fluorescence? I understand the physics of the effect itself, my question is the curious wording. Compared to a thin concentrated sample, the effect might better be described as "saturation," while compared to a thick dilute sample, it's actually related to a lack of absorption by other elements.
--Scott Calvin Faculty at Sarah Lawrence College Currently on sabbatical at Stanford Synchrotron Radiation Laboratory _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
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