Figure 4.4.4.4

Pershan, P. S.

doi:10.1107/97809553602060000566

International
Tables for
Crystallography
Volume B
Reciprocal space
Edited by U. Shmueli

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International Tables for Crystallography (2006). Vol. B. ch. 4.4, p. 459 | 1 | 2 |

Figure 4.4.4.4

P. S. Pershan^a ^*

^aDivision of Engineering and Applied Science and The Physics Department, Harvard University, Cambridge, MA 02138, USA
Correspondence e-mail: pershan@deas.harvard.edu

Figure 4.4.4.4

Scattering intensities in reciprocal space from three-dimensional tilted hexatic phases: (a) the smectic-I and (b) the smectic-F. The variation of the intensity along the $[Q_{L}]$ direction indicates interlayer correlations that are absent in Figs. 4.4.4.1(d) and (e). The peak widths $[\Delta {\bf Q}_{L1,2}]$ and $[\Delta {\bf Q}_{H1,2}]$ correspond to the four inequivalent widths in the smectic-F phase. Similar inequivalent widths exist for the smectic-I phase. The circle through the shaded points in (a) indicates the reciprocal-space scan that directly measures the hexatic order. A similar scan in the smectic-C phase would have intensity independent of $[\chi]$ .