High-temperature electron hole liquid in diamond wires

The density functional theory is used to study the properties of the electron hole liquid (EHL) in diamond quantum wires. Take a quantum wire with a circular cross section with radius R. Electrons and holes move freely along the z-axis. To calculate the energy and equilibrium density of the EHL, the Schrödinger equations for electrons and holes are solved numerically. Calculations have shown that the EHL is stable in diamond wires with a radius of several exciton radii. As the radius of the quantum wire decreases, the equilibrium density increases and the EHL energy decreases. So, with the radius of the quantum wire equal to the exciton radius (1.38 nm), the equilibrium linear density and energy of the EHL can reach values of 2.2 ∙ 107 cm–1 and – 317 meV, respectively. Estimates show that for these values of density and energy, the critical temperature of the EHL is Tc ≈ 370 K

The inactivation of eggs of helminthes under the action of narrowband ultraviolet radiation of excilamps

The inactivation of eggs of Opisthorchis felineus and Diphyllobothrium latum in the water under the action of UV excilamps at 222 and 282 nm in dependence on the surface dose of radiation was studied. It was observed that the water disinfection from eggs of helminthes was more efficient at 222 nm, than at 282 nm. At the surface dose up to 5 mJ/cm2 of UV radiation at 222 nm up to 85 % of Opisthorchis felineus eggs were inactivated. At the comparable surface dose of UV radiation at 222 nm up to 56 % of Diphyllobothrium latum eggs were inactivated

Influence of uv radiation and discharge plasma on feed wheat seeds for acceleration of plants

In a rapidly changing unstable climate, the possible acceleration of plant growth and ripening is critical to food security in at least the region. This problem is especially relevant for areas with risky farming, which includes almost all of Siberia, and the Tomsk region in particular. Here we present the next results of a study of the effect of UV and ionizing radiation on cereals, namely, Iren wheat

Electron hole liquid in diamînds formed by nanosecond laser pulses

Electron-hole liquid (EHL) is a condensed state of non-equilibrium charge carriers, which can exist in some semiconductor materials at low temperature and high carrier density. Phenomenon of EHL is a promising thing for development of diamond based electronic devices, such as opto-electronical switches. Earlier in our paper [1] we showed that the presence of EHL strongly increases the photoconductivity of diamond sample

Temperature dependence of the absorption edge of synthetic diamond

Using optical spectroscopy in the spectral range from 200 to 300 nm, the absorption edge and transmission spectra of 7 samples of synthetic diamond of IIa type in the temperature range from 12 K to 470 K was studied. Using numerical methods, the temperature dependences of optical absorption into the free exciton state were obtained for negative and positive phonon branches

Photoluminescence and optical absorption of diamond samples containing NV centers

NV center is an impurity defective complex in diamond, obtained by irradiating with highenergy electrons samples containing nitrogen in a substituting position and post radiating annealing. NV centers are observed in several charge states negative (zero phonon line at 638 nm), neutral (ZPL at 575 nm), and, possibly, positive (ZPL at 533 nm). NV centers in diamond are candidates for qubits for quantum computing, the basis of high speed magnetometric sensors, sources of single photons, and also emitting centers of optically active laser media

Solar wind detector based on Cherenkov radiation in diamond

To date a relevant task is the development of miniature Cherenkov detectors that could be placed on microsatellites for studying near Earth space, in particular, for observing the charged particles flows (solar wind) captured by the Earth's magnetic field. Solar activity can negatively affect the exploration of outer space, in particular, lead to the failure of the electronic equipment of spacecraft, which leads to significant financial losses. Therefore, the problem of monitoring and space weather forecasting is a very important task

Prototype of a diamond based UV source as an emitter

The report deals with the results of a study of the exciton cathodoluminescence of diamond, as well as the creation of a prototype of a cathodoluminescent ultraviolet source based on it

Changes in the exciton cathodoluminescence spectra of diamond at elevated temperatures

The study of exciton cathodoluminescence in diamond is not only scientific but also practical importance. Ultraviolet radiation at a wavelength of 235 nm can be used for disinfection, activation of surface reactions, photochemistry, and more. Thus, diamond is a promising material for creating a cathodoluminescent source of ultraviolet radiation

Detection of high energy electrons by Cherenkov radiation in diamond

Cherenkov detectors for detection of high energy particles are widely used. To obtain the necessary information about the characteristics of the particles (energy, type, etc.) can by analyze of the Cherenkov radiation (CR). Cherenkov detectors in various fields of science and technology are used. However, there are Cherenkov detectors applications, for example, in thermonuclear reactors and spacecraft, where special requirements are imposed on the radiator material. One of the promising radiator materials with high temperature and radiation resistance is diamond. In addition, the diamond has a low energy threshold for CR due to its high refractive inde