Crystallographic Information Framework

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Modulated and composite structures dictionary (msCIF) version 1.0.1




   The displacive distortion of a given atom or rigid group (see
   also _atom_site_rot_Fourier_param_phase) is usually parameterized
   by Fourier series. Each term of the series commonly adopts two
   different representations: the sine-cosine form,
            Ac cos(2\p k r)+As sin(2\p k r),
   and the modulus-argument form,
            |A| cos(2\p k r+\f),
   where k is the wave vector of the term and r is the atomic
   average position. _atom_site_displace_Fourier_param_phase is the
   phase (\f/2\p) in cycles of the complex amplitude corresponding
   to the Fourier term defined by
   _atom_site_displace_Fourier_axis and

Appears in list containing _atom_site_displace_Fourier_param_id
The permitted range is -1.0 -> 1.0
Enumeration default: 0.0

Type: numb

Category: atom_site_displace_Fourier_param