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Adsorption site dependence of vibrational excitations of molecular hydrogen

AutorCarbonell, Eduard; Corso, Martina; Brión-Rios, Anton X.; Cabrera-Sanfélix, Pepa ; Sánchez-Portal, Daniel ; Pascual, José I.
Fecha de publicación2015
CitaciónVAS15 (2015)
ResumenTransition-metal phtalocyanines are a well-known class of molecules used as model to study the interaction between metal surfaces and metal-organic compounds. These kind of metal-organic complexes present a wide range of properties and functionalities which depend on the coordination of their central metal ion, such as magnetism or the adsorption of small gas molecules. In this work we study Chlorinated Manganese Phtalocyanine (Cl-MnPc) molecules deposited on a Ag (111) substrate. We explore the adsorption characteristics of this system by means of a combined Low Temperature Scanning Tunneling and Atomic Force Microscope. After deposition on a room temperature substrate, a fraction of (dechlorinated) MnPc molecules coexist with Cl-MnPc on the surface. Moreover, Cl-MnPc can be controllably dechlorinated after the evaporation process. We find that both molecules are a preferential site of adsorption for molecular Hydrogen, which is known to present a bistable vibrationally mediated behavior depending on its different adsorption configurations. Inelastic tunneling of electrons from a STM can excite such bistability which induces a fingerprint close to zero-bias on differential conductance measurements. Additionally, force spectra reveal differences on the electrostatic forces exerted between the tip and the molecule when the tunneling electrons trigger such hydrogen fluctuations. We find that these fingerprints are strongly modified by the presence or absence of Chlorine atoms in the phtalocyanine molecules.
DescripciónResumen del póster presentado a la 15th International Conference on Vibrations at Surfaces, celebrada en Donsotia-San Sebastián (España) del 22 al 26 de junio de 2015.
URIhttp://hdl.handle.net/10261/137317
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