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 20K were studied. The tilts were determined by measuring the anisotropy ratio of resonantly scattered intensities from the 6324keV level in 15N with the photon beam parallel and perpendicular to the Grafoil planes. The results at n≤1CML are in good agreement with calculations based on molecular dynamic simulations (MDS). At n>1CML, 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<2.7CML predicted by MDS and Monte Carlo (MC) calculations.
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