MANIFESTATION OF AN EXCITED ELECTRON IN e⁺e¯ → γγ REACTION

The differential cross section and some polarization observables have been calculated for the e⁺e¯ → γγ reaction taking into account the contribution of the excited electron. The spin correlation coefficients were calculated for the case when both beams are polarized. We consider two approaches for the excited electron contribution: the eу → γγ contact interaction and the exchange of the excited electron in t- and u-channels. Numerical estimations are given for the excited electron contribution to the differential cross section and spin correlation coefficients for vari-ous values of the electron beam energy and excited electron mass.

Competitive Light Emission from Excited Electron and Proton Systems in Polyaniline Doped with P-Toluenesulfonic Acid When Electrically Powered

Polyaniline doped with p-toluenesulfonic acid (PANI/PTSA) emits light in two different ranges owing to electron and proton excitations. The protons effectively compete with the electrons in the wet PANI/PTSA in capturing the electrical energy.

Competitive Light Emission from Excited Electron and Proton Systems in Polyaniline Doped with P-Toluenesulfonic Acid When Electrically Powered

Polyaniline doped with p-toluenesulfonic acid (PANI/PTSA) emits light in two different ranges owing to electron and proton excitations. The protons effectively compete with the electrons in the wet PANI/PTSA in capturing the electrical energy.

Dual-sensitized modification engineering with enhanced photocatalytic degradation for organic dye

In order to use solar irradiation efficiently, we should fabricate a high reactive photocatalyst under the visible light. It has been clearly revealed that if the titanium dioxide (TiO2) is irradiated with light, as a stable catalyst, excited electron–hole pairs of it could apply in degrading organic pollutants, but the wavelength of optical absorption is narrower than 380 nanometers. In this work, we designed and fabricated a unique TiO2 base heterojunction photocatalyst dual-sensitized by cadmium sulfide (CdS) and lead sulfide (PbS) with wide-spectrum (300-800 nm) response. Moreover, the degradation efficiency of nanocomposites reached 99.9% under visible light, which was 5 times over pure TiO2. This ternary Z-scheme structure materials will be well-promising photocatalysts.

High magnetoresistance of hexagonal boron nitride-graphene heterostructure-based MTJ through excited-electron transmission

This work presents an ab-initio study of a few-layers hexagonal boron nitride (hBN) and hBN-graphene heterostructure sandwiched between Ni(111) layers. The aim of this study is to understand the electron...

Charge transfer dynamic in van der waals heterojunctions formed by thiophene-based semiconductor polymer and exfoliated franckeite Investigated from resonantly core excited electron

Organic/inorganic van der Waals heterojunctions formed by a combination of 2D materials with semiconductor polymer films enable the fabrication of new device architectures that are interesting for electronic and optoelectronic...

Experimental and theoretical studies on luminescent mechanisms and different visual color of the mixed system composed of MgGeO3:Mn, Eu and Zn2GeO4:Mn

In this work, the mixed system composed of Zn2GeO4: Mn and MgGeO3: Mn, Eu was synthesized by the high temperature solid phase method. Under the external excitation, visual color of samples was yellow. However, after the excitation was completed, visual color turned to be red. From luminescence spectrum, it was found that Zn2GeO4: Mn emitted green fluorescence of 534 nm under the excitation of 375 nm light. At the same time, MgGeO3: Mn, Eu emitted both fluorescence and persistent luminescence (PersL) of 668 nm. Moreover, the properties of PersL present samples were superior to other red PersL materials. Fine band structures from density functional theory (DFT) indicated that there were different luminescent mechanisms of Zn2GeO4: Mn and MgGeO3: Mn, Eu. When Zn2GeO4: Mn was excited, electron transitioned from VB to CB directly. Through CB, the electron was captured by the 4T2(D) of Mn ion, then the electron jumped from 4T2(D) to VB and recombined at once with the previous hole and emitted a 534 nm photon. When MgGeO3: Mn, Eu was excited, electron transitioned from 6A1(S) of Mn ion to CB and left a hole. Through CB, electron was captured by 7F6 levels of Eu[Formula: see text] and remained metastable for a long time, which slowed down the recombined rate between electron and hole. Under thermal stimulation, the captured electron returned to CB from 7F6 levels and was recaptured by the 4T2(D) of Mn. The electron transitioned down toward 6A1(S) and recombined with the hole immediately, then emitted a photon with 668 nm.