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
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
Hi all, I think this comes from the misunderstanding of the effect and the try to explain it as the "additional" absorption of outgoing light. Am I right? kicaj W dniu 10-11-16 19:19, Scott Calvin pisze:
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
participants (3)
-
"Dr. Dariusz A. Zając" -
Matthew Marcus -
Scott Calvin