Out-of-plane orientation of multilayer N2 films adsorbed on Grafoil at 20 K

Y. Finkelstein, R. Moreh, O. Shahal

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

A study of the out-of-plane tilt angle of adsorbed 15N2 molecules on Grafoil using the nuclear resonance photon scattering (NRPS) technique is presented. Molecular coverages between n = 0.6 and 5.0 commensurate monolayers (CML) at 20 K were studied. The tilts were determined by measuring the anisotropy ratio of resonantly scattered intensities from the 6324 keV level in 15N with the photon beam parallel and perpendicular to the Grafoil planes. The results at n≤1 CML are in good agreement with calculations based on molecular dynamic simulations (MDS). At n>1 CML, it was possible to deduce only the average tilt angle of N2 molecules over all layers. However, by relying on the reported structural properties of N2 multilayers obtained by n-diffraction (ND), the tilt of N2 molecules in the various layers was deduced and compared with theoretical expectations. The measured anisotropy ratios seem to rule out the occurrence of a pinwheel (PW) structure at n<2.7 CML predicted by MDS and Monte Carlo (MC) calculations.

Original languageEnglish
Pages (from-to)265-276
Number of pages12
JournalSurface Science
Volume437
Issue number3
DOIs
StatePublished - 1 Sep 1999

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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