AVS 61st International Symposium & Exhibition
    Surface Science Wednesday Sessions
       Session SS-WeA

Paper SS-WeA7
Ordering of L-alaninate Superstructures on Cu(001)

Wednesday, November 12, 2014, 4:20 pm, Room 309

Session: Chirality and Enantioselectivity on Surfaces
Presenter: Erkan Ciftlikli, Rutgers University
Authors: E.Z. Ciftlikli, Rutgers University
B.J. Hinch, Rutgers University
Correspondent: Click to Email
Multiple domains of a c(4x2) superstructure are produced following dissociative L-Alanine adsorption on Cu(001) at temperatures of 0 oC and above. The anticipated structure at 0.25ML relies on stabilization of a tridendate surface species, in ordered arrays, held together with intermolecular H bonding. He atom diffraction is benign, and the films can be investigated over the course of days. The saturated c(4x2) structure is stable up to ~200oC. In contrast the subsaturation surfaces are thermally unstable and a slow relaxation occurs after nucleation of c(4x2) domains. He-surface bound state resonances are seen to affect the symmetries of the He diffraction intensities and the inelastic He-phonon cross sections observed from the chiral adsorbate. The enhanced inelastic scattering intensities are used to compare the vibrational characteristics of saturated and sub-saturation L-Ala/Cu(001) surfaces.