Quoting Bruce Ravel
That's what hephaestus does if you do not specify some other width. It doesn't seem to be documented correctly in the ifeffit reference manual, but if the width argument to f1f2() is given as a negative number smaller than -0.1, the tabulated natual width is used. That is,
f1f2(energy=my.energy, z=29, width=-1)
will give you f1 and f2 over some energy range for copper using the natural line width.
Great! It's a very useful hint, Bruce. In fact, it sounded strange to me it
wasn't already implemented this behaviour in Ifeffit. It would be useful to
add it to the next release of Ifeffit reference manual.
Thanks,
M.
--
Mauro Rovezzi