scippneutron.conversion.tof.wavevector_from_wavelength

scippneutron.conversion.tof.wavevector_from_wavelength(*, wavelength, beam)

Compute a wavevector from a wavelength.

The result is

\[Q = 2 \pi \frac{\hat{b}}{\lambda}\]

where \(\hat{b}\) is the normalized beam vector.

Parameters:

• wavelength (Variable) – De Broglie wavelength \(\lambda\).

• beam (Variable) – The direction the neutron travels \(\vec{b}\). It does not have to be normalized.

Returns:

Variable – Wavevector \(k\). Has unit 1/ångström.