Recent Raman data on nanocrystallite arrays are revised within the microscopic theory for peaks positions and broadening (linewidth). The combines elasticity theory-like approach optical phonons used in order to evaluate structure Green's function method applied phonon lines broadening. These theories supported by atomistic calculations dynamical matrix bond polarization model calculate intensi...

Width-controlled M-type hexagonal SrFe12O19 nanoribbons were synthesized for the first time via polyvinylpyrrolidone (PVP) sol assisted electrospinning followed by heat treatment in air, and their chemical composition, microstructure and magnetic performance were investigated. Results demonstrated that as-obtained SrFe12O19 nanoribbons were well-crystallized with high purity. Each nanoribbon wa...

The superconductivity in (NbTa)1-X(HfZrTi)X high-entropy alloy is analyzed using the theory of strong-coupled superconductor. It concluded that a strong coupled variation superconducting transition temperature from 7.9 K to 4.6 as x increases 0.2 0.84 arises because decrease electronic band width due localization and broadening band. suggested crystalline randomness which gives rise mobility ed...

A classical Fourier amplitude theory of combined Doppler and pressure broadening in the impact approximation is developed which treats phase changes due to translation and collision on an equal basis. Radiator motion is accounted for properly by includingspeed dependence in the collision frequency and velocity dependence in the distribution function for phase shifts and final velocities as the ...

Confocal Raman spectroscopy has emerged as a major, versatile workhorse for the non-invasive characterization of graphene. Although it is successfully used to determine the number of layers, the quality of edges, and the effects of strain, doping and disorder, the nature of the experimentally observed broadening of the most prominent Raman 2D line has remained unclear. Here we show that the obs...

We measured Raman scatterings from various single-walled carbon nanotube (SWNT) samples over a wide temperature range (4-1000 K). The G-band peaks showed clear temperature dependence, namely decrement in the Raman shift frequency and broadening of the peak width as temperature increases. The main G-band peak (G peak) showed universal temperature dependence in Raman shift for the various SWNT sa...

We present spectroscopic, photometric and astrometric observations of four bright L dwarfs identified in the course of the 2MASS near-infrared survey. Our spectroscopic data extend to wavelengths shortward of 5000Å in the L0 dwarf 2MASSJ0746+2000 and the L4 dwarf 2MASSJ0036+1840, allowing the identification of absorption bands due to MgH and CaOH. The atomic resonance lines Ca I 4227Å and Na I ...

The results of study of the optical reflection and contactless electroreflection from a periodic system of multiple GaAs/AlGaAs quantum wells will be presented. The quantum well width was 15 or 20 nm and the barriers were 104 nm thick. In this system, the electromagnetic resonance of the Bragg reflection occurs at the frequency that coincides or is close to the frequency of the exciton-polarito...

Innovative applications of the Rietveld method [1-3] are likely to include new developments in microstructure analysis. More and more samples show microstructure effects on line profile shape, width and position. Reasons are obviously the powder diffractometer resolution improvements at leading synchrotron sources, and the increasing user number. When the minimal full width at half maximum is a...

We discuss the limits of applying spectroscopic methods for the determination of magnetic fields that are based on the Zeeman effect and allow for extending the field diagnostics to conditions inwhich the Zeemansplit pattern is not resolvable. We analyze the diagnostic limits in terms of the minimummagnetic field that canbedetermined for a givenLorentzian line-width. This formof analysis isusef...