scholarly journals Analytical calculation of cold-atom scattering

1999 ◽  
Vol 59 (3) ◽  
pp. 1998-2005 ◽  
Author(s):  
V. V. Flambaum ◽  
G. F. Gribakin ◽  
C. Harabati
Keyword(s):  
Analytical Calculation ◽  
Cold Atom ◽  
Atom Scattering

Observation of a Feshbach Resonance in Cold Atom Scattering

1998 ◽  
Vol 81 (1) ◽  
pp. 69-72 ◽  
Author(s):  
Ph. Courteille ◽  
R. S. Freeland ◽  
D. J. Heinzen ◽  
F. A. van Abeelen ◽  
B. J. Verhaar
Keyword(s):  
Feshbach Resonance ◽  
Cold Atom ◽  
Atom Scattering

ATOMIC CLOCKS AND COLD ATOM SCATTERING

2002 ◽  
Author(s):  
CHAD FERTIG ◽  
RONALD LEGERE ◽  
J. IRFON REES ◽  
KURT GIBBLE ◽  
SERVAAS KOKKELMANS ◽  
...  
Keyword(s):  
Cold Atom ◽  
Atomic Clocks ◽  
Atom Scattering

Atomic Clocks and Cold Atom Scattering

2003 ◽  
pp. 137-145
Author(s):  
Chad Fertig ◽  
Ronald Legere ◽  
J.Irfon Rees ◽  
Kurt Gibble ◽  
Servaas Kokkelmans ◽  
...  
Keyword(s):  
Cold Atom ◽  
Atomic Clocks ◽  
Atom Scattering

Photoassociation as a probe of Feshbach resonances in cold-atom scattering

1998 ◽  
Vol 57 (6) ◽  
pp. R4102-R4105 ◽  
Author(s):  
F. A. van Abeelen ◽  
D. J. Heinzen ◽  
B. J. Verhaar
Keyword(s):  
Cold Atom ◽  
Feshbach Resonances ◽  
Atom Scattering

Observation of a Shape Resonance in Cold-Atom Scattering by Pulsed Photoassociation

1996 ◽  
Vol 77 (26) ◽  
pp. 5194-5197 ◽  
Author(s):  
H. M. J. M. Boesten ◽  
C. C. Tsai ◽  
B. J. Verhaar ◽  
D. J. Heinzen
Keyword(s):  
Cold Atom ◽  
Shape Resonance ◽  
Atom Scattering

Monte Carlo Modelling of Secondary Electron Yield from Rough Surfaces

1990 ◽  
Vol 48 (1) ◽  
pp. 422-423
Author(s):  
John C. Russ
Keyword(s):  
Monte Carlo ◽  
Energy Loss ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Analytical Calculation ◽  
Mean Free Path ◽  
Single Scattering ◽  
High Energy ◽  
Secondary Electron Yield ◽  
Electron Yield

Monte-Carlo programs are well recognized for their ability to model electron beam interactions with samples, and to incorporate boundary conditions such as compositional or surface variations which are difficult to handle analytically. This success has been especially powerful for modelling X-ray emission and the backscattering of high energy electrons. Secondary electron emission has proven to be somewhat more difficult, since the diffusion of the generated secondaries to the surface is strongly geometry dependent, and requires analytical calculations as well as material parameters. Modelling of secondary electron yield within a Monte-Carlo framework has been done using multiple scattering programs, but is not readily adapted to the moderately complex geometries associated with samples such as microelectronic devices, etc.This paper reports results using a different approach in which simplifying assumptions are made to permit direct and easy estimation of the secondary electron signal from samples of arbitrary complexity. The single-scattering program which performs the basic Monte-Carlo simulation (and is also used for backscattered electron and EBIC simulation) allows multiple regions to be defined within the sample, each with boundaries formed by a polygon of any number of sides. Each region may be given any elemental composition in atomic percent. In addition to the regions comprising the primary structure of the sample, a series of thin regions are defined along the surface(s) in which the total energy loss of the primary electrons is summed. This energy loss is assumed to be proportional to the generated secondary electron signal which would be emitted from the sample. The only adjustable variable is the thickness of the region, which plays the same role as the mean free path of the secondary electrons in an analytical calculation. This is treated as an empirical factor, similar in many respects to the λ and ε parameters in the Joy model.

A novel analytical calculation of magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping

2020 ◽  
pp. 1-15
Author(s):  
Jianqi Li ◽  
Yu Zhou ◽  
Jianying Li
Keyword(s):  
Magnetic Field ◽  
Conformal Mapping ◽  
Permanent Magnet ◽  
Flux Density ◽  
Analytical Method ◽  
Electromotive Force ◽  
Analytical Calculation ◽  
Air Gap ◽  
Permanent Magnet Machines ◽  
Peak Value

This paper presented a novel analytical method for calculating magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping. Firstly, flux density without slots and complex relative air-gap permeance of slotted air gap are derived from conformal transformation separately. Secondly, they are combined in order to obtain normalized flux density taking account into the slots effect. The finite element (FE) results confirmed the validity of the analytical method for predicting magnetic field and back electromotive force (BEMF) in the slotted air gap of spoke-type permanent-magnet machines. In comparison with FE result, the analytical solution yields higher peak value of cogging torque.

Lifetime Regime in the Electrically-Detected Transient Grating Method Applied to Amorphous and Microcrystalline Silicon Films

2002 ◽  
Vol 715 ◽  
Author(s):  
P. Sanguino ◽  
M. Niehus ◽  
S. Koynov ◽  
P. Brogueira ◽  
R. Schwarz ◽  
...  
Keyword(s):  
Carrier Transport ◽  
Analytical Calculation ◽  
Chemical Vapor ◽  
Silicon Films ◽  
Dielectric Relaxation Time ◽  
Transient Grating ◽  
Minority Carrier Diffusion Length ◽  
Carrier Recombination ◽  
Thin Silicon ◽  
Good Agreement

AbstractThe minority-carrier diffusion length in thin silicon films can be extracted from the electrically-detected transient grating method, EDTG, by a simple ambipolar analysis only in the case of lifetime dominated carrier transport. If the dielectric relaxation time, τdiel, is larger than the photocarrier response time, τR, then unexpected negative transient signals can appear in the EDTG result. Thin silicon films deposited by hot-wire chemical vapor deposition (HWCVD) near the amorphous-to-microcrystalline transition, where τR varies over a large range, appeared to be ideal candidates to study the interplay between carrier recombination and dielectric response. By modifying the ambipolar description to allow for a time-dependent carrier grating build-up and decay we can obtain a good agreement between analytical calculation and experimental results.

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