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Systematic Absences of the magnetic space group P21'21'21 (#19.27) in the setting (a, b, c; 0, 0, 0) of the parent space group Pnma (No. 62)


Values of h, k, l:  h integer, k integer, l integer

Warning: h, k, l are referred to the parent-like setting

Systematic absences for special reflections:


Diffraction vector type:   (0 0 l)     ->      Systematic absence:    l = 2n

For l = 1 : I /= 0 F = (Fx,Fy,0)
For l = 2 : I = 0 F = (0,0,Fz)

Diffraction vector type:   (0 k 0)     ->      Systematic absence:    k = 2n + 1

For k = 1 : I = 0 F = (0,Fy,0)
For k = 2 : I /= 0 F = (Fx,0,Fz)

Diffraction vector type:   (h 0 0)     ->      Systematic absence:    h = 2n + 1

For h = 1 : I = 0 F = (Fx,0,0)
For h = 2 : I /= 0 F = (0,Fy,Fz)

[Show form of structure factor for every type of reflection]


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