title: Room temperature differential conductance measurements of triethylamine molecules adsorbed on Si(001).
abstract: We have measured the differential conductance of the triethylamine molecule (N(CH2CH3)3) adsorbed on Si(001)-2 × 1 at room temperature using scanning tunneling spectroscopy. Triethylamine can be engaged in a dative bonding with a silicon dimer, forming a Si-Si-N(CH2CH3)3 unit. We have examined the datively bonded adduct, either as an isolated molecule, or within an ordered molecular domain (reconstructed 4 × 2). The differential conductance curves, supported by DFT calculations, show that in the explored energy window (±2.5 near the Fermi level) the main features stem from the uncapped dangling bonds of the reacted dimer and of the adjacent unreacted ones that are electronically coupled The formation of a molecular domain, in which one dimer in two is left unreacted, is reflected in a shift of the up dimer atom occupied level away from the Fermi level, likely due to an increased π-bonding strength. In stark contrast with the preceding, pairs of dissociated molecule (a minority species) are electronically decoupled from the dimer dangling bond states. DFT calculation show that the lone-pair of the Si-N(CH2CH3)2 is a shallow level, that is clearly seen in the differential conductance curve.
authors: Sorbonne Universités, UPMC Univ Paris 6, Laboratoire de Chimie Physique Matière et Rayonnement, UMR 7614, 11 rue Pierre et Marie Curie, 75005 Paris, France. ahmed.naitabdi@upmc.fr francois.rochet@upmc.fr.
authors: Ahmed
authors: A
authors: Naitabdi
authors: Sorbonne Universités, UPMC Univ Paris 6, Laboratoire de Chimie Physique Matière et Rayonnement, UMR 7614, 11 rue Pierre et Marie Curie, 75005 Paris, France. ahmed.naitabdi@upmc.fr francois.rochet@upmc.fr and CNRS, LCPMR, UMR 7614, 11, rue Pierre et Marie Curie, 75005, Paris, France.
authors: François
authors: F
authors: Rochet
authors: Sorbonne Universités, UPMC Univ Paris 6, Laboratoire de Chimie Physique Matière et Rayonnement, UMR 7614, 11 rue Pierre et Marie Curie, 75005 Paris, France. ahmed.naitabdi@upmc.fr francois.rochet@upmc.fr and CNRS, LCPMR, UMR 7614, 11, rue Pierre et Marie Curie, 75005, Paris, France.
authors: Stéphane
authors: S
authors: Carniato
authors: Sorbonne Universités, UPMC Univ Paris 6, Laboratoire de Chimie Physique Matière et Rayonnement, UMR 7614, 11 rue Pierre et Marie Curie, 75005 Paris, France. ahmed.naitabdi@upmc.fr francois.rochet@upmc.fr and CNRS, LCPMR, UMR 7614, 11, rue Pierre et Marie Curie, 75005, Paris, France.
authors: Fabrice
authors: F
authors: Bournel
authors: Sorbonne Universités, UPMC Univ Paris 6, Laboratoire de Chimie Physique Matière et Rayonnement, UMR 7614, 11 rue Pierre et Marie Curie, 75005 Paris, France. ahmed.naitabdi@upmc.fr francois.rochet@upmc.fr and CNRS, LCPMR, UMR 7614, 11, rue Pierre et Marie Curie, 75005, Paris, France.
authors: Jean-Jacques
authors: JJ
authors: Gallet