Figure 4.3.7.1

Gjønnes, J.; Steeds, J. W.

doi:10.1107/97809553602060000593

International
Tables for
Crystallography
Volume C
Mathematical, physical and chemical tables
Edited by E. Prince

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International Tables for Crystallography (2006). Vol. C. ch. 4.3, p. 418

Figure 4.3.7.1

J. Gjønnes^e and J. W. Steeds^m

Figure 4.3.7.1

(a) Dispersion-surface section for the symmetric four-beam case (0, g, g + h, m), γk is a function of k_x, referred to (b), where k_x = k_y = 0 corresponds to the exact Bragg condition for all three reflections. The two gaps appear at s_g = ±(U_h − U_m)/k with widths (U_g ± U_{g + h})/k.