GSAS absorption correction & peak shape

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1. For powder neutron absorption correction (Debye-Scherrer), which is
the definition of the absorption coefficient (A * lambda) that needs
to be written into the exp-file? Is it just the value of
(mue * crystal radius)? How is it related to the neutron absorption
coefficient that is calculated by the program after entering the
unit cell contents?

2. Does somebody have experience with fitting a CW peak shape that is
almost, but not completely lorentzian?

Thanks,

Thilo Herrmannsdoerfer
kris049@rzbox.uni-wuerzburg.de

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