Its best to use the terms axial plane and horizontal plane to avoid
confusion.
Alan, I'm confused! What do you mean by those terms? I thought "axial
divergence" was "beam hits different points along the two theta axis" -
is that a misconception?
Last point, what do you mean by vertical divergence? The Topas
manual defines the 'axial divergence' which can be limited by soller
slits
Arie, I meant divergence in the direction you measure, which I was
assuming as vertical. eg: finite size of source, detector, flatness of
sample, achievement (or not) of focusing geometry. The effect of soller
slits depends which way up you bolt them onto the instrument.
Jon
