# Crystalline Phases of Alkyl-Thiol Monolayers on Liquid Mercury

 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. Note: Order does not necessarily reflect citation order of authors. 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). Access Status: Full text of the requested work is not available in DASH at this time (“dark deposit”). For more information on dark deposits, see our FAQ. Full Text & Related Files: Ocko_Crystalline.pdf (606.6Kb; PDF) 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 Other Sources: http://www.liquids.deas.harvard.edu/peter/2005.pdf/AlkonHg_PRL94_05.pdf Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10354244 Downloads of this work: