(IUCr) SANSPOL study of a magnetic fluid

Figure 2
The detector plane $[{\bf a-b}]$ and the neutron beam direction $[\bf c]$ . The predefinition of $[{\bf H}_{\rm ext} = H\,{\bf z}/z]$ fixes the meaning of the angles $[\alpha]$ , $[\Psi]$ and $[\Omega]$ . $[2 \theta]$ is the scattering angle, with $[Q \lambda = 4 \pi \sin\theta]$ and $[{\bf Q} = \{ \cos\theta\cos\Psi, \cos\theta\sin\Psi, -\sin\theta \}]$ .