Hi Juan Antonio: It looks like this is fluorescence data. It is likely that you have significant self-absorption if this is a Pt foil. Try to apply an "infinite" sample correction to this data before fitting. That should correct the SO2 somewhat. A much better thing to do is to take this data in transmission. i suspect that if it is a standard foil, it is optimized for transmission and should be measured in that mode. Carlo On Tue, 5 Dec 2006, Juan Antonio Maciá Agulló wrote:
Hi all,
I did a multiple shell fit for platinum foil and the results were similar: S02 = 0.51 and the uncertainty varies from 0.02 to 0.03 depending on the fit. Please find enclosed a file with values of energy, I0 and I of the platinum foil. I include this file if someone has curiosity on raw data and has time, otherwise forget it. Maybe I can suppose a value of 0.85 for S02 and follow with the analysis of the data, then...CN equation proposed in the first e-mail is ok?
Thank you very much
Best regards, JA
-- Carlo U. Segre -- Professor of Physics Associate Dean for Special Projects, Graduate College Illinois Institute of Technology Voice: 312.567.3498 Fax: 312.567.3494 segre@iit.edu http://www.iit.edu/~segre segre@debian.org