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Incommensurate Smectic Order at the Free Surface in the Nematic Phase of (4-N-Heptylphenyl-4'-(4"-Nitrobenzoyloxy)Benzoate (DB7NO_2))

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1987

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10.1103/PhysRevA.35.1868

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American Physical Society
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Ocko, B. M., Peter S. Pershan, C. R. Safinya, and L. Y. Chiang. 1987. Incommensurate smectic order at the free surface in the nematic phase of \(4-n-heptylphenyl-4'-(4"-nitrobenzoyloxy)benzoate (DB7NO_2)\). Physical Review A 35(4): 1868-1872.

Abstract

We report x-ray reflectivity measurements on the free surface of (4-n-heptylphenyl-4'-(4"-nitrobenzoyloxy)benzoate (DB7NO_2)) at the nematic to smectic-A phase transition, (T_{NA}=99.9^{\circ}C). The free surface in the nematic phase exhibits smecticlike ordering at two q vectors, one which is commensurate with the smectic-A monolayer q vector (q_2). The other q vector is incommensurate corresponding to ordering at (\sim 0.59q_2). The commensurate peak constructively interferes with the air-liquid interface while the incommensurate peak destructively interferes. These results are compared with bulk-phase x-ray scattering measurements.

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http://nrs.harvard.edu/urn-3:HUL.InstRepos:10357480

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