On Friday 01 June 2007, I.Reitz wrote: A couple more comments:
And I have also a question to you: Why do you use 30 eV/e- as ionization energy for the gases? Is there a reference for that?
That's not very defensible. 32 eV is probably a better number. 30=32 isn't an awful approximation ;-)
In addition, don´t we have to take the room temperature into account not only the pressure, that means: Density(Temperature) = (273,15K/293,15K)*0.003749g/cm^3(at 273,15K)
Of course you do. Hephaestus is really supposed to be a quick-n-dirty tool to help you out at the beamline and is targeted at the XAS user. If you want to absorb aproximately 10 percent of the photons in I0, it doesn't really seem necessary to make the user measure the ambient temperature in the hutch. Or, to put it another way, having controls for temperature or density or whatever adds complexity to Hephaestus's interface without adding much value to its intended user. B -- Bruce Ravel ---------------------------------------------- bravel@anl.gov Molecular Environmental Science Group, Building 203, Room E-165 MRCAT, Sector 10, Advanced Photon Source, Building 433, Room B007 Argonne National Laboratory phone and voice mail: (1) 630 252 5033 Argonne IL 60439, USA fax: (1) 630 252 9793 My homepage: http://cars9.uchicago.edu/~ravel EXAFS software: http://cars9.uchicago.edu/~ravel/software/exafs/