Energy spectra of an exciton in a Gaussian potential and magnetic field

2004 ◽  
Vol 323 (1-2) ◽  
pp. 132-137 ◽  
Author(s):  
Juan Gu ◽  
Jiu-Qing Liang
Keyword(s):  
Magnetic Field ◽  
Energy Spectra ◽  
Gaussian Potential

scholarly journals Excitation And Ionization By Auroral Protons

1966 ◽  
Vol 19 (3) ◽  
pp. 309 ◽  
Keyword(s):  
Magnetic Field ◽  
Energy Range ◽  
Pitch Angle ◽  
Proton Energy ◽  
Ionization Rate ◽  
Energy Spectra ◽  
Proton Fluxes ◽  
Atmospheric Ionization ◽  
The Magnetic Field

Height distributions are presented for the atmospheric ionization rate and Balmer radiation resulting from precipitation of auroral protons. These results have been computed assuming proton fluxes with several different energy spectra and pitch-angle distributions about the magnetic field, the total proton energy range being restricted to 1-1000 keY.

scholarly journals Particle Acceleration in Collisionless Magnetic Reconnection

2001 ◽  
Vol 203 ◽  
pp. 555-557
Author(s):  
P. K. Browning ◽  
G. E. Vekstein
Keyword(s):  
Magnetic Field ◽  
Field Component ◽  
Charged Particles ◽  
Energy Spectra ◽  
Uniform Field ◽  
Two Dimensional ◽  
Point Field ◽  
Field Geometry ◽  
Collisionless Reconnection ◽  
Accelerated Particles

We investigate the acceleration of charged particles in the framework of collisionless reconnection. A steady reconnection scenario is considered, with a two dimensional X-point magnetic field geometry having also a uniform field component transverse to the plane of the X-point field, and an inductive electric field generating an inflow of particles. Test particle trajectories are studied, and the energy spectra of the accelerated particles are determined.

FEW-ELECTRON DOUBLE-LAYER QUANTUM DOTS IN MAGNETIC FIELDS: ENERGY SPECTRUM OF AN ARTIFICIAL MOLECULE

1999 ◽  
Vol 13 (09n10) ◽  
pp. 291-302
Author(s):  
WENFANG XIE ◽  
CHUANYU CHEN ◽  
D. L. LIN
Keyword(s):  
Magnetic Field ◽  
Angular Momentum ◽  
Magnetic Fields ◽  
Double Layer ◽  
Ground State ◽  
Energy Spectra ◽  
Electron Interaction ◽  
Magic Numbers ◽  
Total Orbital Angular Momentum ◽  
Artificial Molecule

An exact method is proposed to diagonalize the Hamiltonian of a double-layer quantum dot containing N electrons in arbitrary magnetic fields. For N = 3 and 4, energy spectra of the dot are calculated as a function of the applied magnetic field. As a result of the electron–electron interaction, complete sets of "magic numbers" are found to characterize the total orbital angular momentum of the N-electron dot in the ground state for both the polarized and unpolarized spins. It is shown that discrete transitions of the ground state between magic numbers takes place when the external magnetic field changes. The origin of the magic numbers is completely explained in terms of the underlying symmetry.

A possible mechanism for <theta> aurora formation

1995 ◽  
Vol 13 (7) ◽  
pp. 698-703 ◽  
Author(s):  
B. V. Rezhenov ◽  
I. M. Vardavas
Keyword(s):  
Magnetic Field ◽  
Boundary Layer ◽  
Plasma Sheet ◽  
Energy Spectra ◽  
System Of Equations ◽  
The Sun ◽  
High Latitudes ◽  
Plasma Sheet Boundary Layer ◽  
Interchange Instability ◽  
Field Lines

Abstract. A mechanism for the formation of <theta> aurora connected with the development of an interchange instability on the plasma sheet boundary layer (PSBL) is suggested. The PSBL is assumed to be deep inside the region of closed magnetic field lines. A system of equations connecting currents in the ionosphere and magnetosphere is solved numerically. It is found, using realistic ionospheric and magnetospheric parameters, that in a period of 8–10 min a system of plasma bars directed to the Sun arises at high latitudes. The system of bars is about 1000 km in width and 3000 km in length and approximates the Θ aurora. The suggested mechanism allows an explanation of a number of Θ aurora features such as the appearance probability, electric field directions, energy spectra of precipitating particles, and its location.

Electron energization during merging of self-magnetized, high-beta, laser-produced plasmas

2021 ◽  
Vol 87 (4) ◽  
Author(s):  
G. Fiksel ◽  
W. Fox ◽  
M.J. Rosenberg ◽  
D.B. Schaeffer ◽  
J. Matteucci ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Energy ◽  
Intense Laser ◽  
Energy Spectra ◽  
Laser Beams ◽  
Magnetized Plasmas ◽  
Plasma Plumes ◽  
Biermann Battery ◽  
High Beta

Electron energization during merging of magnetized plasmas is studied using the OMEGA and OMEGA EP laser facilities by colliding two plasma plumes, each containing a Biermann-battery self-generated magnetic field. Two neighbouring plasma plumes are produced by intense laser beams, and the anti-parallel Biermann fields merge and reconnect in the process of the plumes’ expansion and collision. To isolate the merging as an acceleration source, the electron energy spectra obtained from two-plume collision shots are compared with the spectra from single-plume shots. Single-plume shots exhibit an energized electron tail with energies up to ${\sim }250\ \textrm {keV}$ . The electrons in merging experiments are additionally accelerated by ${\sim }50\text {--}100$ keV compared to single-plume shots.

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