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Phthalocyanine adsorption to graphene on Ir(111): evidence for decoupling from vibrational spectroscopy
M Endlich1, S Gozdzik1, N Néel1
1Institut für Physik, Technische Universität Ilmenau, D-98693 Ilmenau, Germany.
Abstract:
Phthalocyanine molecules have been adsorbed to Ir(111) and to graphene on Ir(111). From a comparison of scanning tunneling microscopy images of individual molecules adsorbed to the different surfaces alone it is difficult to discern potential differences in the molecular adsorption geometry. In contrast, vibrational spectroscopy using inelastic electron scattering unequivocally hints at strong molecule deformations on Ir(111) and at a planar adsorption geometry on graphene. The spectroscopic evidence for the different adsorption configurations is supported by density functional calculations.
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