5,037 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Electrons"  
Results: 1 - 24 next
open access

Passage of Electrons Through Matter

Description: One of the oldest properties of electrons is their emission of x-rays (discrete and continuous spectra) when impinging on matter. Cloud-chamber tracks show light ionization, and considerable multiple scattering, except for fast electrons. Tracks are long and range indefinite.
Date: September 9, 1953
Creator: Vaughan, Edward
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Charge injection into small semiconductor particles

Description: We report on the effect of the injection of electrons into small CdS particles on their spectroscopy. Solvated electrons were generated pulse radiolytically and their reaction with the particles was monitored. As a result of the excess charge, the absorption by the particle in the exciton region is bleached. The bleaching tacks the shift in band edge as the particle size decreases. However, excess electrons in larger particles are more efficient tan in small particles. It is concluded that the … more
Date: June 1, 1995
Creator: Lawless, D.; Luangdilok, C.; Cook, A.R. & Meisel, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Damping of Dislocation Motion by Conduction Electrons in Metals.

Description: The rate of energy absorption from a moving dislocation by conduction electrons is recalculated using the semiclassical Boltzman transport equation and the model of a free electron gas. Temperature-independent values of the electronic damping coefficients for edge and screw dislations are found in similar magnitudes. The results are compared to previous work by Kravchenko and Brailsford.
Date: October 31, 1972
Creator: Jassby, K. M. & Shull, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Experimental Research on the Laser Cyclotron Auto-Resonance Accelerator “LACARA”

Description: The Laser Cyclotron Auto-Resonant Accelerator LACARA has successfully operated this year. Results are summarized, an interpretation of operating data is provided in the body of the report, and recommendations are made how the experiment should be carried forward. The Appendix A contains a description of the LACARA apparatus, currently installed at the Accelerator Test Facility, Brookhaven National Laboratory. This report summarizes the project, extending over three grant-years.
Date: November 11, 2008
Creator: Marshall, T C
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Isomorphic classical molecular dynamics model for an excess electronin a supercritical fluid

Description: Ring polymer molecular dynamics (RPMD) is used to directly simulate the dynamics of an excess electron in a supercritical fluid over a broad range of densities. The accuracy of the RPMD model is tested against numerically exact path integral statistics through the use of analytical continuation techniques. At low fluid densities, the RPMD model substantially underestimates the contribution of delocalized states to the dynamics of the excess electron. However, with increasing solvent density, th… more
Date: August 4, 2008
Creator: Miller III, Thomas F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Model for l/f Flux Noise in SQUIDs and Qubits

Description: We propose a model for 1/f flux noise in superconducting devices (f is frequency). The noise is generated by the magnetic moments of electrons in defect states which they occupy for a wide distribution of times before escaping. A trapped electron occupies one of the two Kramers-degenerate ground states, between which the transition rate is negligible at low temperature. As a result, the magnetic moment orientation is locked. Simulations of the noise produced by a plausible density of randomly o… more
Date: January 19, 2007
Creator: Koch, Roger H.; DiVincenzo, David P. & Clarke, John
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Electron Cloud Generation And Trapping in a Quadrupole Magnet at the Los Alamos PSR

Description: A diagnostic to measure electron cloud formation and trapping in a quadrupole magnet has been developed, installed, and successfully tested at PSR. Beam studies with this diagnostic show that the electron flux striking the wall in the quadrupole is comparable to or larger than in an adjacent drift. In addition, the trapped electron signal, obtained using the sweeping feature of diagnostic, was larger than expected and decayed very slowly with an exponential time constant of 50 to 100 {micro}s. … more
Date: November 14, 2007
Creator: Macek, R. J.; Browman, A. A.; Ledford, J. E.; Borden, M. J.; O'Hara, J. F.; McCrady, R. C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Efficient multi-exciton emission from quantum dots.

Description: The fundamental spontaneous emission rate an emitter can be modified by its photonic environment. By enhancing the spontaneous emission rate, there is a possibility of extracting multi-exciton energies through radiative decay. In this report, we explore using high Q and small volume cavities to enhance the spontaneous emission rate. We observed greater than 50 folds enhancement in the spontaneous emission from photonic crystal waveguide or microcavity using close-packed monolayer of PbS quantum… more
Date: September 1, 2010
Creator: Luk, Ting Shan
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Injection Into Electron Plasma Traps

Description: Computational studies and experimental measurements of plasma injection into a Malmberg-Penning trap reveal that the number of trapped particles can be an order of magnitude higher than predicted by a simple estimates based on a ballistic trapping model. Enhanced trapping is associated with a rich nonlinear dynamics generated by the space-charge forces of the evolving trapped electron density. A particle-in-cell simulation is used to identify the physical mechanisms that lead to the increase in… more
Date: December 2, 2003
Creator: Gorgadze, Vladimir; Pasquini, Thomas A.; Fajans, Joel & Wurtele, Jonathan S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hydromagnetic Instabilities Caused by Runaway Electrons

Description: "The possibility of the excitation of hydromagnetic instabilities caused by a beam of runaway electronics is investigated. It is found that if the wave length and frequency of the wave are such that the Doppler shift of the frequency due to the runaways' motion causes the electrons to see their cyclotron frequency, and if the electric field rotates in the same direction as the electrons do about the confining magnetic field, then an instability occurs."
Date: 1958
Creator: Dawson, J. M. & Bernstein, Ira B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Tables of Electron Radial Functions and Tangents of Phase Shifts for Light Nuclei (Z=1 through 10)

Description: From Introduction: "This Monograph, supplemented by ORNL-3207 [9], should eliminate completely the need for use of approximate formulas (e.g. those of Kotani and Ross [10]). The formulation of the problem has been summarized in sec. II. This is followed in sec. III by a discussion of the methods used in numerical calculations. Sec. IV contains a detailed explanation to facilitate the use of present tables."
Date: August 6, 1964
Creator: Bhalla, C. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cyclooctatetraenes Tetrakis-Annelated with α-Dithio- or α-Diselenocarbonyl Groups: Diradicals Predicted To Have Ground States with 10 π Electrons in the Eight-Membered Ring and Two-Center, Three-Electron, σ Bonds between Two Pairs of Chalcogen Atoms

Description: Article on cyclooctatetraenes tetrakis-annelated with α-dithio- or α-diselenocarbonyl groups.
Date: February 12, 2010
Creator: Zhou, Xin; Hrovat, David A. & Borden, Weston T.
Item Type: Refine your search to only Article
Partner: UNT College of Arts and Sciences
open access

Emittance and Current of Electrons Trapped in a Plasma Wakefield Accelerator

Description: In recent experiments plasma electrons became trapped in a plasma wakefield accelerator (PWFA). The transverse size of these trapped electrons on a downstream diagnostic yields an upper limit measurement of transverse normalized emittance divided by peak current, {var_epsilon}{sub N,x}/I. The lowest upper limit for {var_epsilon}{sub N,x}/I measured in the experiment is 1.3 {center_dot} 10{sup -10} m/A.
Date: September 24, 2008
Creator: Kirby, N.; Blumenfeld, I.; Clayton, C. E.; Decker, F. J.; Hogan, M. J.; Huang, C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen