Excitation Of Electromagnetic Radiation Research Articles

Structure and Luminescence of Ce-doped Lu2SiO5 Nanophosphor

ABSTRACTNanophosphors correspond to nanostructured inorganic insulator materials that emit light under particle or electromagnetic radiation excitation. In this work we investigate the structure and luminescent properties of Ce-doped Lu2SiO5 (LSO) nanophosphors prepared by solution combustion synthesis with the Ce content 0.1 to 12 at. %. Samples were characterized by transmission electron microscopy (TEM), line scan electron energy-loss spectroscopy (EELS), x-ray diffraction (XRD), and electron paramagnetic resonance (EPR) spectroscopy. Photoluminescence excitation and emission spectra are composed of two major bands centered at 360 and 430 nm, respectively. These results reveal a red-shift and enhanced Stokes shift for the nanophosphors when compared to bulk. Ce content was also found to affect photoluminescence emission intensity and fluorescent lifetime. The nanophosphor concentration quenching curve presents a broad maximum centered at 1 at.%. Lifetime measurements show a continuous decrease from 34 to 21 ns as Ce content is increased.

Excitation of Electromagnetic Radiation in Laminated Rocks under Acoustic Influence

The results are presented for the investigations into parameters of electromagnetic signal during acoustic action on laminated rocks represented by serpentinite. It is established that in the spectrum of electromagnetic signal, the maxima can appear due to the beating on superposition of close wave frequencies. The analysis of the obtained data indicates the resonance oscillation mechanism of electromagnetic signal origination.

Theory of electromagnetic radiation excitation in a plasma waveguide with an electron beam

Theory of electromagnetic radiation excitation in a plasma waveguide with an electron beam

Radio emission from a helical electron beam-plasma system in a twisted magnetic field

The excitation of electromagnetic radiation near the harmonics of electron plasma frequency from a helical electron beam travelling parallel to a helical magnetic field through a stationary inhomogeneous plasma is studied. The motivation behind this study is to explain the observed characteristics of the type III solar radio bursts and thus to predict the nature of the plasma system responsible for the generation of these radio bursts.

Excitation of electromagnetic oscillation in the plasma zone of an electronion oscillating discharge

Experimental data are presented on the excitation of electromagnetic oscillations in the plasma of an electron-ion oscillating discharge. The mechanism by which the neutral medium is excited by means of a beam of oscillating electrons and the resulting excitation of electromagnetic radiation are considered. The experimental results reasonably agree with theoretical conclusions for the idealized case of the passage of an electron beam through a neutral medium. A possible mechanism for the acceleration of high-energy electrons by an electromagnetic wave is hypothesized.

Excitation of electromagnetic radiation through induced compton scattering in the neighborhood of pulsars

Excitation of electromagnetic radiation through induced compton scattering in the neighborhood of pulsars