374 research outputs found
The origin of high-resolution IETS-STM images of organic molecules with functionalized tips
Recently, the family of high-resolution scanning probe imaging techniques
using decorated tips has been complimented by a method based on inelastic
electron tunneling spectroscopy (IETS). The new technique resolves the inner
structure of organic molecules by mapping the vibrational energy of a single
carbonmonoxide (CO) molecule positioned at the apex of a scanning tunnelling
microscope (STM) tip. Here, we explain high-resolution IETS imaging by
extending the model developed earlier for STM and atomic force microscopy (AFM)
imaging with decorated tips. In particular, we show that the tip decorated with
CO acts as a nanoscale sensor that changes the energy of the CO frustrated
translation in response to the change of the local curvature of the surface
potential. In addition, we show that high resolution AFM, STM and IETS-STM
images can deliver information about intramolecular charge transfer for
molecules deposited on a~surface. To demonstrate this, we extended our
numerical model by taking into the account the electrostatic force acting
between the decorated tip and surface Hartree potential.Comment: 5 pages, 4 figure
THE ISSUES OF LEGAL SERVICE AND THE DEVELOPMENT OF THIS FIELD IN UZBEKISTAN
The essence of the decision of President Shavkat Miromonovich Mirziyoyev on January 19, 2017 βOn measures to fundamentally improve the activity of the legal serviceβ, the attention paid to lawyers, the opportunities given to them, the conditions created
Imaging Pauli repulsion in scanning tunneling microscopy
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
ultra-high 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/transducer is identified. It probes the short-range Pauli repulsion and
converts this signal into variations of the junction conductance.Comment: 4 pages, 4 figures, accepted to Phys. Rev. Let
The mechanism of high-resolution STM/AFM imaging with functionalized tips
High resolution Atomic Force Microscopy (AFM) and Scanning Tunnelling
Microscopy (STM) imaging with functionalized tips is well established, but a
detailed understanding of the imaging mechanism is still missing. We present a
numerical STM/AFM model, which takes into account the relaxation of the probe
due to the tip-sample interaction. We demonstrate that the model is able to
reproduce very well not only the experimental intra- and intermolecular
contrasts, but also their evolution upon tip approach. At close distances, the
simulations unveil a significant probe particle relaxation towards local minima
of the interaction potential. This effect is responsible for the sharp
sub-molecular resolution observed in AFM/STM experiments. In addition, we
demonstrate that sharp apparent intermolecular bonds should not be interpreted
as true hydrogen bonds, in the sense of representing areas of increased
electron density. Instead they represent the ridge between two minima of the
potential energy landscape due to neighbouring atoms
Student business incubator as a tool for development of youth entrepreneurship in Russia and Kyrgyzstan
Π Π΄Π°Π½Π½ΠΎΠΉ ΡΡΠ°ΡΡΠ΅ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡΡΡ Π²ΠΎΠΏΡΠΎΡΡ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΌΠΎΠ»ΠΎΠ΄Π΅ΠΆΠ½ΠΎΠ³ΠΎ ΠΏΡΠ΅Π΄ΠΏΡΠΈΠ½ΠΈΠΌΠ°ΡΠ΅Π»ΡΡΡΠ²Π° ΠΈ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΠΉ ΠΈΠ½ΡΠ΅Π³ΡΠ°ΡΠΈΠΈ ΠΌΠΎΠ»ΠΎΠ΄Π΅ΠΆΠΈ Π ΠΎΡΡΠΈΠΈ ΠΈ ΠΡΡΠ³ΡΠ·ΡΡΠ°Π½Π° Π² ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΡΠ΅ΡΠ΅ ΡΠ΅ΡΠ΅Π· ΠΎΠ±ΠΌΠ΅Π½ ΠΎΠΏΡΡΠΎΠΌ ΠΏΠΎ ΡΠΎΠ·Π΄Π°Π½ΠΈΡ Π±ΠΈΠ·Π½Π΅Ρ-ΠΈΠ½ΠΊΡΠ±Π°ΡΠΎΡΠΎΠ².This article discusses the development of youth entrepreneurship and the possible integration of the youth of Russia and Kyrgyzstan in the economic sector through the exchange of experiences on the establishment of business incubators
Ab initio study of a mechanically gated molecule: From weak to strong correlation
The electronic spectrum of a chemically contacted molecule in the junction of
a scanning tunneling microscope can be modified by tip retraction. We analyze
this effect by a combination of density functional, many-body perturbation and
numerical renormalization group theory, taking into account both the
non-locality and the dynamics of electronic correlation. Our findings, in
particular the evolution from a broad quasiparticle resonance below to a narrow
Kondo resonance at the Fermi energy, correspond to the experimental
observations.Comment: 4 pages, 3 figure
- β¦