Hi Pushan, can you tell more about the experiment and the way of data collecting? how did you measure your samples? which method did you use? what kind of samples do you have? the answer of your question is not stricted, but generaly I would say that the noise level should be independent of the samples, did you change something on the beamline or program between samples/measurements? e.g. sample time, no. of repeats, you moved in /out detector, amplification gain, etc.... kicaj

-----Original Message----- From: ifeffit-bounces@millenia.cars.aps.anl.gov [mailto:ifeffit-bounces@millenia.cars.aps.anl.gov] On Behalf Of Pushan Shah Sent: Tuesday, September 09, 2008 7:49 AM To: ifeffit@millenia.cars.aps.anl.gov Subject: [Ifeffit] Noise level in XANES spectrum

Hello Everyone,

I have a general question regarding noise level of XANES spectrum. I have collected XANES data for an element which is present in ppm level in my samples.

Some samples are exhibiting varying degree of noise in XANES spectrum.

Is the noise level of XANES spectrum would be proportional or consistent with the concentration of the sample? As XANES spectra for some of my samples with relatively higher concentration of this element are exhibiting greater level of noise than those with relatively lower concentrations. Will sample matrix play any role in the noise level?

Thanks and I appreciate your help.

regards, Pushan

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