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  • Title: Structures of chiral smectic-C mesophases revealed by polarization-analyzed resonant x-ray scattering.
    Author: Mach P, Pindak R, Levelut AM, Barois P, Nguyen HT, Baltes H, Hird M, Toyne K, Seed A, Goodby JW, Huang CC, Furenlid L.
    Journal: Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics; 1999 Dec; 60(6 Pt A):6793-802. PubMed ID: 11970599.
    Abstract:
    We report polarization-analyzed, resonant x-ray diffraction at the sulfur K edge performed upon free-standing liquid-crystal films. Our studies of the thiobenzoate liquid-crystal enantiomer 10OTBBB1M7 yield the polarization states of resonant satellite peaks arising from characteristic superlattices in the chiral smectic-C (SmC(*)) variant phases, including the antiferroelectric SmC(*)(A), ferrielectric SmC(*)(FI1) and SmC(*)(FI2), as well as SmC(*)(alpha). The observed polarizations agree with the clock model of chiral smectic-C variants, and rule out other proposals made to date for these structures. Data from the 10OTBBB1M7 racemate also support the clock model. Our resonant diffraction results from a thiophene liquid-crystal compound reveal the same superlattice periodicities seen in corresponding antiferroelectric and ferrielectric phases of 10OTBBB1M7.
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