Abstract
A scanning tunneling microscope (STM) has been equipped with a nanoscale force sensor and signal transducer composed of a single D2 molecule that is confined in the STM junction. The uncalibrated sensor is used to obtain ultrahigh geometric image resolution of a complex organic molecule adsorbed on a noble metal surface. By means of conductance-distance spectroscopy and corresponding density functional calculations the mechanism of the sensor and transducer is identified. It probes the short-range Pauli repulsion and converts this signal into variations of the junction conductance.
Highlights
A scanning tunneling microscope (STM) has been equipped with a nanoscale force sensor and signal transducer composed of a single D2 molecule that is confined in the STM junction
This disadvantage arises because the STM probes the local density of states (LDOS) in the vicinity of the Fermi level, while details of the chemical structure are primarily encoded in lower-lying orbitals
It has been shown recently that noncontact atomic force microscopy is able to resolve the inner structure of a complex organic molecule, by imaging short-range repulsive interactions that depend on the total electron density (TED) [7]
Summary
A scanning tunneling microscope (STM) has been equipped with a nanoscale force sensor and signal transducer composed of a single D2 molecule that is confined in the STM junction. We can model the junction in the STHM mode, i.e., at jVj < jVinelj, by a single D2 molecule physisorbed [16] between the tip apex and the sample surface.
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