Sqw_symmetrize(s): extend the S(|q|,w) in both energy sides
The resulting S(q,w) is the combination of S(q,w) and S(q,-w), which
is thus symmetric in energy:
S(q,w) = S(q,-w)
The S(q,w) is a dynamic structure factor aka scattering function.
The incoming data set should NOT contain the Bose factor, that is it
should be 'classical'.
To obtain a 'classical' S(q,w) from an experiment, use first:
Sqw_deBosify(s, T)
The positive energy values in the S(q,w) map correspond to Stokes processes,
i.e. material gains energy, and neutrons loose energy when scattered.
input:
s: Sqw data set (classical, often labelled as S*)
2D data set with w as 1st axis (rows, meV), q as 2nd axis (Angs-1).
output:
s: S(|q|,w) symmetrised in energy
Example: Sqw_symmetrize(s, 300)
See also: Sqw_Bosify, deBosify, Sqw_dynamic_range, Sqw_scatt_xs
(c) E.Farhi, ILL. License: EUPL.