Nonradiative annihilation of a positron on bound electrons

2020 ◽  
Vol 101 (4) ◽  
Author(s):  
B. Najjari ◽  
S. F. Zhang ◽  
X. Ma ◽  
A. B. Voitkiv
Keyword(s):  
Bound Electrons

A quantitative approach to inner shell losses

1978 ◽  
Vol 36 (1) ◽  
pp. 526-527 ◽  
Author(s):  
R.D. Leapman ◽  
P. Rez ◽  
D.F. Mayers
Keyword(s):  
Energy Transfer ◽  
Cross Section ◽  
Cross Sections ◽  
Accurate Determination ◽  
Background Intensity ◽  
Core Excitation ◽  
Quantitative Basis ◽  
Cross Section Differential ◽  
Bound Electrons

Microanalysis by EELS has been developing rapidly and though the general form of the spectrum is now understood there is a need to put the technique on a more quantitative basis (1,2). Certain aspects important for microanalysis include: (i) accurate determination of the partial cross sections, σx(α,ΔE) for core excitation when scattering lies inside collection angle a and energy range ΔE above the edge, (ii) behavior of the background intensity due to excitation of less strongly bound electrons, necessary for extrapolation beneath the signal of interest, (iii) departures from the simple hydrogenic K-edge seen in L and M losses, effecting σx and complicating microanalysis. Such problems might be approached empirically but here we describe how computation can elucidate the spectrum shape.The inelastic cross section differential with respect to energy transfer E and momentum transfer q for electrons of energy E0 and velocity v can be written as

Donor-bound electrons in quantum rings under magnetic fields

2007 ◽  
Vol 76 (7) ◽  
Author(s):  
M. Amado ◽  
R. P. A. Lima ◽  
C. González-Santander ◽  
F. Domínguez-Adame
Keyword(s):  
Magnetic Fields ◽  
Quantum Rings ◽  
Bound Electrons

scholarly journals The relaxation times of donor bound electrons in germanium

2020 ◽  
Author(s):  
R. Kh. Zhukavin ◽  
K. A. Kovalevsky ◽  
Yu. Yu. Choporova ◽  
V. V. Tsyplenkov ◽  
S. G. Pavlov ◽  
...  
Keyword(s):  
Relaxation Times ◽  
Bound Electrons

Scattering of X-Rays by Bound Electrons

Nature ◽  
1930 ◽  
Vol 126 (3176) ◽  
pp. 398-399 ◽  
Author(s):  
SALIGRAM BHARGAVA
Keyword(s):  
X Rays ◽  
Bound Electrons

Magneto-optical spectroscopy of donor bound electrons in Hg1−xCdxTe: Voigt and Faraday geometry

1988 ◽  
Vol 65 (6) ◽  
pp. 547-551 ◽  
Author(s):  
J.B. Choi ◽  
L.S. Kim ◽  
H.D. Drew ◽  
D.A. Nelson
Keyword(s):  
Optical Spectroscopy ◽  
Bound Electrons

Spin dephasing of fluorine-bound electrons in ZnSe

2012 ◽  
Vol 85 (12) ◽  
Author(s):  
A. Greilich ◽  
A. Pawlis ◽  
F. Liu ◽  
O. A. Yugov ◽  
D. R. Yakovlev ◽  
...  
Keyword(s):  
Spin Dephasing ◽  
Bound Electrons

scholarly journals Generalized collision operator for fast electrons interacting with partially ionized impurities

2018 ◽  
Vol 84 (6) ◽  
Author(s):  
L. Hesslow ◽  
O. Embréus ◽  
M. Hoppe ◽  
T. C. DuBois ◽  
G. Papp ◽  
...  
Keyword(s):  
Growth Rate ◽  
Electric Fields ◽  
Collision Operator ◽  
Impurity Content ◽  
Fast Electrons ◽  
Generalized Operator ◽  
Partially Ionized ◽  
High Electric Fields ◽  
Bound Electrons ◽  
Fokker Planck

Accurate modelling of the interaction between fast electrons and partially ionized atoms is important for evaluating tokamak disruption mitigation schemes based on material injection. This requires accounting for the effect of screening of the impurity nuclei by the cloud of bound electrons. In this paper, we generalize the Fokker–Planck operator in a fully ionized plasma by accounting for the effect of screening. We detail the derivation of this generalized operator, and calculate the effective ion length scales, needed in the components of the collision operator, for a number of ion species commonly appearing in fusion experiments. We show that for high electric fields, the secondary runaway growth rate can be substantially larger than in a fully ionized plasma with the same effective charge, although the growth rate is significantly reduced at near-critical electric fields. Furthermore, by comparison with the Boltzmann collision operator, we show that the Fokker–Planck formalism is accurate even for large impurity content.

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