Linearity in Monochromator Scans

If the monochromator is scanned on the fast axis,

(i.e. in point spectra), the scan positions will be linear in wavelength. This is because it is a physical property of the monochromator that the wavelength, and not the energy, is proportional to motor position.

Note that we cheat you in this case - even though you specified an energy step size when setting up the scan, the actual scan won't have a constant energy step (but a constant wavelength step).

If the monochromator is scanned on the slow axis,

the scan positions will be linear in eV, which is probably what you would prefer anyway.