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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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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Title: Incommensurate Smectic Order at the Free Surface in the Nematic Phase of \(4-N-Heptylphenyl-4'-(4"-Nitrobenzoyloxy)Benzoate (DB7NO_2)\)
Author: Ocko, B. M.; Pershan, Peter S.; Safinya, C. R.; Chiang, L. Y.

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Citation: 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.
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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.
Published Version: doi:10.1103/PhysRevA.35.1868
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10357480
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