posted by Mathieu Gisselbrecht at Aug 12, 2005 8:26 AM
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About the theory, I should say that at E=20eV, there are nowadays three calculations performed HRM-SOW, TDCC, and ECS. At the (e,2e) symposium F. Martin showed that for equal energy sharing, they all give the same results within a few % deviation (or less) to each other. Furthemore, the Brauning et al data fits nicely to the calculations. So I would say at this stage, so far so good for the theory.... I forgot to mention that I would not suspect that there is a dramatic change at E=25 eV....Today, I would rather think that we (at least I) do not control/understand the calibration procedure so well. But I am sure that we will fix that rather soon, definitely before any publication !! In a first step, I would normalize the data to the theory (Patricia's one for instance) to get the normalization factor at each theta1 (as I did in the file *_rel.opj), and then apply it to Hydrogen taking into account the ratio between hydrogen and helium cross section and the number of events.I hope that you will read this message.
posted by Mathieu Gisselbrecht at Aug 10, 2005 10:39 PM
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Hi Tim,As soon as you will be login you will be able to download the origin's files. For the moment, only the Helium TDCS in coplanar geometry are available. There are two files:
- Helium_Coplanar_abs : which is what one can get from the expected normalisation from Brauning et al (JCP 31 1998).
- Helium_Coplanar_rel: which is a set graphics renormalized to Patricia's data for value of theta1.