Cosmic-Ray Muon Tomography Setup: Long-Term Life of Drift Tube Chambers

Physics of Atomic Nuclei - For investigation of the cosmic muon scattering tomography (MST) concept at NRC ‘‘Kurchatov Institute’’—IHEP the large-scale setup has been...     

Electronic structure and thermal stability of rare earth metalloporphyrins based on ytterbium

The features of the electronic structure of Yb4d, N1s, C1s, O1s, Br3d core levels and the valence band of ytterbium metalloporphyrins Yb(acac)TPPBr8, Yb(acac)TPP, TPPBr8, and TPP are studied by photoelectron spectroscopy. The position and structure of the Yb4f level for Yb(acac)TPPBr8 are determined by resonant photoemission at the BESSY-II synchrotron center. Simulations of the electronic structure of the valence band show good agreement between the calculated and experimental data. The change in the electronic structure of porphyrins during implantation of the central atom of ytterbium, namely, a more uniform redistribution of the electron density between nitrogen atoms of pyrrole and aza groups, is revealed. The photoelectron spectra of Yb4d states demonstrate the trivalent metal state (Yb³⁺) in rare-earth metalloporphyrins. The partial destruction of bromine ytterbium tetraphenylporphyrin compound as a result of thermal action is demonstrated.     

The intrinsic structure of spherical particles of opal

The intrinsic structure of spherical SiO₂ particles synthesized by hydrolysis of tetraethyl orthosilicate in an alcohol-water-ammonia medium was studied using transmission electron microscopy. It was established that the relatively large spherical silica particles were “tertiary” structures made up of smaller spherical particles (“ secondary” particles), which in turn consisted of even smaller primary spherical particles 5–10 nm in diameter. It was shown that, under the experimental conditions, the large SiO₂ particles can contain a central core comprising primary particles surrounded by several layers of secondary particles smaller than the core diameter.     

Atomic structure of the Cu(410)-O surface: STM visualization of oxygen and copper atoms

The structure of the Cu(410)-O surface is studied by a scanning tunneling microscope (STM) with atomic resolution. Tunneling is accomplished for various states of the tungsten STM probe, which allows oxygen and copper atoms to be visualized separately.     

Using a nanoscale extraordinary hall effect sensor to measure the tip field of a magnetic cantilever

The spatial distribution of the magnetic field around the tip of a magnetic cantilever coated with a cobalt film 50 nm thick is investigated using an FePt extraordinary Hall effect sensor. The magnetic field’s dependence on the distance between the sensor’s surface and the MFM cantilever is measured and found to be inversely proportional to the cubic distance, as predicted in theory. The magnetic field measured on the MFM cantilever tip is found to be 0.02 T.     

Atomic structure of a regular Si(2 2 3) triple step staircase

An atomically accurate regular triple step array with a period of 4.8 nm has been fabricated on the vicinal Si(5 5 7) surface. Its atomic structure was studied on different length scales by scanning tunneling microscopy, low energy electron diffraction and photoelectron spectroscopy. These complementary methods allowed to identify the average orientation of the regular triple step staircase as Si(2 2 3) and to give a deeper insight into the atomic arrangement of this structure.     

Investigation of the Influence of Thermomechanical Treatment on the Structural-Phase State and Mechanical Properties of a VZh171 Alloy

Russian Physics Journal - An analysis of the influence of thermomechanical treatment (TMT) (rolling to a strain degree of 50%, annealing at a temperatures of 600–1200°C, 1 h) on the...     

Collective Effect of Transformation of a Hydrogen Bond Network at the Initial State of Growth of Methane Hydrate

JETP Letters - The molecular dynamics study of the rearrangement of the dynamic hydrogen bond network of liquid water to the crystal hydrogen bond network of methane hydrate in the process of their...     

Anomalous Hall Effect in Frustrated Magnets

Physics of the Solid State - Comparative analysis of Hall effect in substitutional solid solutions Ho0.5Lu0.5B12, Mn1 – xFexSi (0 ≤ x ≤ 1) and...     

Formation of concentration profiles of implanted ions in metallic materials under polyenergetic implantation

A physical and mathematical model of mass transfer in polycrystalline metallic materials under exposure to ion beams is proposed. Alongside bulk indiffusion from the irradiated surface, diffusion along the migrating extensive defects interacting with an impurity is considered. For a polyenergetic ion beam, the contribution of bulk indiffusion is presented as an integral over energy of the product of two functions; one of them describes the energy distribution of ions in a beam and the second represents the implantation profile of monoenergetic ion beam.