Crystalline Phases of Alkyl-Thiol Monolayers on Liquid Mercury

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Crystalline Phases of Alkyl-Thiol Monolayers on Liquid Mercury

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Title: Crystalline Phases of Alkyl-Thiol Monolayers on Liquid Mercury
Author: Ocko, B. M.; Kraack, H.; Pershan, Peter S.; Sloutskin, E.; Tamam, L.; Deutsch, M.

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Citation: Ocko, B. M., H. Kraack, Peter S. Pershan, E. Sloutskin, L. Tamam, and M. Deutsch. 2005. Crystalline phases of alkyl-thiol monolayers on liquid mercury. Physical Review Letters 94(017802).
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Abstract: The structure of octadecanethiol monolyers on liquid Hg surfaces, measured with subangstrom resolution, evolves with increasing coverage from a laterally disordered phase of surface-parallel molecules to ordered rotator phases of surface-normal molecules. For the latter, an abrupt transition is found at 19  Å\(^2\)/molecule from a rectangular packing of molecules tilted by 27\(^\circ\) in the nearest-neighbor direction to a hexagonal unit cell of untilted molecules. The unit cell of the tilted phase is centered for the chains and noncentered for the headgroups. The thiol headgroups associate in pairs with a single Hg atom, and the bonds form long-range orientational order. The different order of thiols on Au(111) and on Hg highlights the subphase's role in determining the overlayer's structure.
Published Version: doi:10.1103/PhysRevLett.94.017802
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