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Vol 44, No 9 (2017)
- Year: 2017
- Articles: 6
- URL: https://journals.rcsi.science/1068-3356/issue/view/14112
Article
Effect of optical pumping on the thulium absorption spectrum saturation and width
Abstract
The numerical solution to optical Bloch equations for the transition Fg = 4 ⇒ Fe = 5 with a wavelength of 410.6 nmin the thulium atom is presented. The absorption spectrum saturation and narrowing effects due to optical pumping are considered in detail.
249-253
Mechanistic models of the ion-solvation shell system
Abstract
The eigenfrequencies of solvation shell oscillations with respect to the ion are estimated in various approximations describing the ion–solvation shell system. The results of comparisonwith experiments suggest that the most appropriate is the model in which the solvated ion is considered to be a spherical rotator formed either by the entire solvation shell or by a layer of solvent molecules adjacent to the outer boundary of the solvation shell.
254-257
Focusing of a diverging ultrasonic beam by a 2D periodic structure into two foci
Abstract
A preliminarily focused (spherically diverging) ultrasonic beam was directed to a structure of metal rods having two-dimensional periodicity and bounded by reflecting surfaces in a dimension in which this periodicity was absent. For the ultrasound frequency taken at the upper boundary of the “transmission” band of the structure, the splitting of the acoustic image of the focus object into two maxima arranged in the sample homogeneity direction is obtained.
258-262
Light-induced glass cutting
Abstract
Theoretical and experimental results on light-induced method for thermal cleaving of brittle materials by the example of silicate glasses are presented. Physical fundamentals of the controlled distribution of thermal fields induced by laser radiation causing compression and tension processes in a material resulting in material cleavage with a zero cut width are developed.
263-265
Numerical simulation of the response of a superconducting film to an alternating magnetic field and the estimation of the possibility of determining the London penetration depth
Abstract
In this paper, we present a descriptive “electrotechnical” model for calculating the distribution of induction currents in a superconducting film near which a measuring coil inducing a local alternating low-frequency magnetic field is placed. The change in the coil inductance, caused by a superconductor with a set London penetration depth of a magnetic field is calculated within the model. The possibility of determining the penetration depth from experimental data is shown; the sensitivity of the proposed approach for films of various thicknesses and various problem configurations is considered.
266-270
Description of small-angle neutron scattering data for nickel–chromium–aluminum alloy within quantum mechanics and classic polydisperse sphere model
Abstract
The modified Yukawa potential is used to fit the nucleus model parameters to the data on small-angle neutron scattering on nickel—chromium—aluminum alloy for the product of the transferred momentum Q and the effective nucleus radius R, satisfying the condition QR ≤ ħ. The analytical polydisperse sphere model is used to calculate the neutron scattering intensity and to determine the most probable macroscopic sphere radius R0 at QR0 ≥ 3ħ.
271-276