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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 \}].

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 40| Part s1| January 2007| Pages s57-s61
doi:10.1107/S0021889807001410
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