HI Will,

I am not entirely sure how this value is determined in Athena, but the number of independent data in a XANES fit is the data range divided by the resolution. If you have a spectrum with a strong pre-edge peak, you can determine the resolution from its width. Otherwise, the resolution is a convolution of the core-hole broadening and the beamline energy resolution.

Athena gives a value that is very close to the value determined directly from the width of a preedge peak.

Sincerely,

Wayne

On Sun, Apr 9, 2017 at 8:59 PM, Will Bennett <w.bennett@griffith.edu.au> wrote:

Hi everyone,

Just a quick question regarding the "Information Content" output in Athena's LCF window. I've recently been playing around with using the Hamilton test (as outlined in Scott Calvin's book "XAFS for Everyone") to interrogate my combinatorics results. As many of you will know, this requires an estimate of the number of independent measurements in the data, in order to determine the degrees of freedom and subsequently the "a" value for computing the Lower Incomplete Beta Function. Would Athena's value for "Information Content" be appropriate to use as an estimate of the number of independent measurements in this case? How is this value of "Information Content" determined in Athena?

Thanks in advance.

Will

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Wayne Lukens

Staff Scientist

Lawrence Berkeley National Lab