scippneutron.conversion.tof.dspacing_from_energy#

scippneutron.conversion.tof.dspacing_from_energy(*, energy, two_theta)[source]#

Compute the d-spacing from the neutron energy.

The result is the inter-planar lattice spacing

\[d = \frac{h}{\sqrt{8 m_n E} \sin \theta}\]

Where \(m_n\) is the neutron mass and \(h\) the Planck constant.

Parameters:

  • energy (Variable) – Neutron energy \(E\).

  • two_theta (Variable) – Scattering angle \(2 \theta\).

Returns:

Variable – Inter-planar lattice spacing \(d\). Has unit ångström.

See also

scippneutron.conversions.beamline

Definition of two_theta.