Hi Damon,
So you're saying you expect the total absorption of the sample to be less than 0.01 absorption lengths? In other words, if the detectors and electronics were identical, you would expect It = I0 exp(-0.01)?
While possible to measure in transmission, such a sample would normally be measured in fluorescence. If done that way, the measurement is routine.
Or am I misunderstanding your description? (I am not entirely sure what you mean by "transmission coefficient.")
--Scott Calvin
Sarah Lawrence College
On Jul 25, 2013, at 4:07 PM, Damon Turney
Hi IFEFFIT community,
I will make measurements soon at Brookhaven's NSLS to do EXAFS, and my sample is a powder mixture of carbon powder, MnO2 powder, and potassium hydroxide liquid. The transmission coefficient of 6.5keV x-rays (the Mn K edge is at ~6.5keV) through the sample is ~0.001 to 0.01. I am told that the ionization chamber detectors can easily detect the x-ray beam after this ~0.01 transmission loss (by increasing the gain on the detector), but I would like to ask the IFEFFIT community if there will be other problems with the EXAFS technique when the transmission coefficient is so low. Does anybody have comments?
Much thanks -- if you have any info I greatly appreciate it! Damon Turney City College of New York _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit