Figure 15
Density distributions of the uniform, lamellar and hexagonal structures: note the Van Hove singularities (i) the inverse square root singularities of the lamellar distribution at = −2 and = 2, (ii) the logarithmic singularity of the hexagonal distribution at ϕ = −2, and (iii) the discontinuous jumps from 1/(31/2π) and 1/[4(31/2)π] to zero at = −3 and = 6, respectively. The skewness of the latter two distributions is given by γLAM = 1 and γHEX = 2. |