On the role of the energy loss function in the image force on a charge moving over supported graphene

2021 ◽  
Vol 130 (17) ◽  
pp. 173103
Author(s):  
Maria Rosa Preciado Rivas ◽  
Milad Moshayedi ◽  
Zoran L. Mišković
Keyword(s):  
Energy Loss ◽  
Loss Function ◽  
Image Force ◽  
Energy Loss Function ◽  
A Charge

DFT study of pressure effects in molecular crystal 4,10-dinitro-2,6,8,12-tetraoxa-4,10-diazatetracyclo-[5.5.0.05,903,11]-dodecane

2014 ◽  
Vol 92 (7) ◽  
pp. 616-624 ◽  
Author(s):  
Zhichao Liu ◽  
Qiong Wu ◽  
Weihua Zhu ◽  
Heming Xiao
Keyword(s):  
High Pressure ◽  
Energy Loss ◽  
Loss Function ◽  
Density Functional ◽  
Pressure Range ◽  
Blue Shift ◽  
Pressure Effects ◽  
Ambient Conditions ◽  
Energy Loss Function ◽  
Electron Transitions

Density functional theory was used to study the structural, electronic, and optical properties of crystalline 4,10-dinitro-2,6,8,12-tetraoxa-4,10-diazatetracyclo-[5.5.0.05,903,11]-dodecane (TEX) under hydrostatic pressure. The results indicate that there is a displacive transition in TEX under compression that has never been found in experiments. As the pressure increases, the band gap gradually decreases but presents an abnormal increase at 61 GPa, called the structural transition; moreover, the gap reduction is more pronounced in the low-pressure range compared with the high-pressure range. An analysis of density of states shows that the electronic delocalization in TEX is enhanced gradually under the influence of pressure. The peaks of the imaginary parts of the dielectric functions, energy-loss function, and reflectivity may come mainly from the electron transitions between the oxygen 2p and nitrogen 2p states. The electron energy-loss function presents a blue shift under compression. TEX has relatively higher optical activity at high pressure than at ambient conditions.

Calculations of Energy-Loss Function for 26 Materials

2016 ◽  
Vol 29 (6) ◽  
pp. 663-670 ◽  
Author(s):  
Yang Sun ◽  
Huan Xu ◽  
Bo Da ◽  
Shi-feng Mao ◽  
Ze-jun Ding
Keyword(s):  
Energy Loss ◽  
Loss Function ◽  
Energy Loss Function

scholarly journals Energy-loss Function for Lead

2017 ◽  
Vol 27 (1) ◽  
pp. 65
Author(s):  
Hieu T. Nguyen-Truong ◽  
Tan-Tien Pham ◽  
Nam H. Vu ◽  
Dang H. Ngo ◽  
Hung M. Le
Keyword(s):  
Energy Loss ◽  
Loss Function ◽  
Density Functional ◽  
Local Density ◽  
Full Potential ◽  
Functional Theory ◽  
Energy Loss Function ◽  
Zero Momentum ◽  
Electron Energy Loss ◽  
Linearized Augmented Plane Wave

We study the energy-loss function for lead in the framework of the time-dependent density functional theory, using the full-potential linearized augmented plane-wave plus local orbitals method. The ab initio calculations are performed in the adiabatic local density approximation. The comparison between the obtained energy-loss function for zero momentum transfer with those from reflection electron energy loss spectroscopy measurements and from first-principles calculations shows good agreement.

scholarly journals Precision measurement of the electron energy-loss function in tritium and deuterium gas for the KATRIN experiment

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
M. Aker ◽  
A. Beglarian ◽  
J. Behrens ◽  
A. Berlev ◽  
U. Besserer ◽  
...  
Keyword(s):  
Energy Loss ◽  
Neutrino Mass ◽  
Loss Function ◽  
Precision Measurement ◽  
Measurement Data ◽  
Gas Mixture ◽  
Systematic Effect ◽  
Effective Electron ◽  
Energy Loss Function ◽  
Katrin Experiment

AbstractThe KATRIN experiment is designed for a direct and model-independent determination of the effective electron anti-neutrino mass via a high-precision measurement of the tritium $$\upbeta $$ β -decay endpoint region with a sensitivity on $$m_\nu $$ m ν of 0.2 $$\hbox {eV}/\hbox {c}^2$$ eV / c 2 (90% CL). For this purpose, the $$\upbeta $$ β -electrons from a high-luminosity windowless gaseous tritium source traversing an electrostatic retarding spectrometer are counted to obtain an integral spectrum around the endpoint energy of 18.6 keV. A dominant systematic effect of the response of the experimental setup is the energy loss of $$\upbeta $$ β -electrons from elastic and inelastic scattering off tritium molecules within the source. We determined the energy-loss function in-situ with a pulsed angular-selective and monoenergetic photoelectron source at various tritium-source densities. The data was recorded in integral and differential modes; the latter was achieved by using a novel time-of-flight technique. We developed a semi-empirical parametrization for the energy-loss function for the scattering of 18.6-keV electrons from hydrogen isotopologs. This model was fit to measurement data with a 95% $$\hbox {T}_2$$ T 2 gas mixture at 30 K, as used in the first KATRIN neutrino-mass analyses, as well as a $$\hbox {D}_2$$ D 2 gas mixture of 96% purity used in KATRIN commissioning runs. The achieved precision on the energy-loss function has abated the corresponding uncertainty of $$\sigma (m_\nu ^2)< {{10}^{-2}}{\hbox {eV}^{2}}$$ σ ( m ν 2 ) < 10 - 2 eV 2 [1] in the KATRIN neutrino-mass measurement to a subdominant level.

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