Calculating neutron scattering spectral weight

[mstekiel]

I feel like the fastest way to reconstruct the maps of spectral weight for chosen energies would be to calculate S(Q,w) for one length of Q, calculate for selected directions of Q, and then add the |Q| (theta) dependence by multiplying with the magnetic form factor.

Do check to verify that, think about a proper implementation of such problem.
Maybe a decomposition of S(Q,w) function into sub functions that deal with different aspects such as above ones would be good.