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Dive into the research topics where A. Sperl is active.

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Featured researches published by A. Sperl.


Journal of the American Chemical Society | 2011

Demetalation of a Single Organometallic Complex

A. Sperl; J. Kröger; Richard Berndt

Single lead-phthalocyanine molecules adsorbed to ultrathin lead islands on Ag(111) are demetalized by transferring the lead atom of the inner macrocycle to the tip of a scanning tunneling microscope. Reactants and products are discriminated by their images and spectroscopic fingerprints.


Physical Review B | 2008

Unoccupied states of individual silver clusters and chains on Ag(111)

A. Sperl; J. Kröger; N. Néel; H. Jensen; Richard Berndt; Andreas Franke; E. Pehlke

Size-selected silver clusters on Ag(111) were fabricated with the tip of a scanning tunneling microscope. Unoccupied electron resonances give rise to image contrast and spectral features which shift toward the Fermi level with increasing cluster size. Linear assemblies exhibit higher resonance energies than equally sized compact assemblies. Density functional calculations reproduce the observed energies within


New Journal of Physics | 2009

Evolution of unoccupied resonance during the synthesis of a silver dimer on Ag(111)

A. Sperl; J. Kröger; Richard Berndt; Andreas Franke; E. Pehlke

0.6\phantom{\rule{0.3em}{0ex}}\mathrm{eV}


Journal of Physical Chemistry A | 2011

Electronic Superstructure of Lead Phthalocyanine on Lead Islands

A. Sperl; J. Kröger; Richard Berndt

and enable an assignment of the resonances to hybridized atomic


New Journal of Physics | 2009

Single-atom contacts with a scanning tunnelling microscope

J. Kröger; N. Néel; A. Sperl; Y F Wang; Richard Berndt

5s


Angewandte Chemie | 2011

Controlled Metalation of a Single Adsorbed Phthalocyanine

A. Sperl; J. Kröger; Richard Berndt

and


Physical Review B | 2009

Local density of states from constant-current tunneling spectra

Martin Ziegler; N. Néel; A. Sperl; J. Kröger; Richard Berndt

5{p}_{z}


Physical Review B | 2010

Direct observation of conductance fluctuations of a single-atom tunneling contact

A. Sperl; J. Kröger; Richard Berndt

orbitals with silver substrate states.


Chemie in Unserer Zeit | 2013

Atom für Atom

A. Sperl; J. Kröger; Richard Berndt

Silver dimers were fabricated on Ag(111) by single-atom manipulation using the tip of a cryogenic scanning tunnelling microscope. An unoccupied electronic resonance was observed to shift toward the Fermi level with decreasing atom–atom distance as monitored by spatially resolved scanning tunnelling spectroscopy. Density functional calculations were used to analyse the experimental observations and revealed that the coupling between the adsorbed atoms is predominantly direct rather than indirect via the Ag(111) substrate. While the substrate influence is small owing to the surface-projected sp band gap, the direct interaction is most likely due to the large extension of the p wave functions at the adsorbate atoms contributing to the resonance.


Physica Status Solidi B-basic Solid State Physics | 2010

Conductance of Ag atoms and clusters on Ag(111): Spectroscopic and time-resolved data

A. Sperl; J. Kröger; Richard Berndt

Lead phthalocyanine (PbPc) deposited on lead islands on Ag(111) forms two-dimensional crystals of densely packed molecules. For particular orientations, the molecular arrays exhibit an electronic superstructure with an extraordinarily large unit cell. The molecules induce a shift of quantum well states, which are confined to the Pb islands. Patterns formed by PbPc on Ag(111) are drastically different.

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J. Kröger

Technische Universität Ilmenau

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