A theoretical framework for absorption (dichroism) and the resonance-enhanced scattering of x-rays by magnetic materials: III. Contributions from atomic spins

1997 ◽  
Vol 9 (20) ◽  
pp. 4237-4260 ◽  
Author(s):  
Stephen W Lovesey ◽  
Ewald Balcar
Keyword(s):  
Magnetic Materials ◽  
Theoretical Framework ◽  
X Rays ◽  
Absorption Dichroism ◽  
Atomic Spins

scholarly journals Imperfect Crystals and Dynamical X-ray Diffraction in the Complex Reflectance Plane

1991 ◽  
Vol 44 (6) ◽  
pp. 693 ◽  
Author(s):  
TJ Davis
Keyword(s):  
Stochastic Model ◽  
Parameter Space ◽  
Langevin Equation ◽  
Planck Equation ◽  
Theoretical Framework ◽  
Crystal Defects ◽  
X Rays ◽  
X Ray Diffraction ◽  
Dynamical Diffraction ◽  
X Ray

A theoretical framework is developed to describe the dynamical diffraction of X-rays in perfect and imperfect crystals. The propagation of the X-ray beam inside the crystal is described by the evolution of a set of trajectories in the complex reflectance plane. The trajectory path is determined from a form of the Takagi-Taupin equations and leads naturally to simple forms for the crystal reflectivity for perfect crystals. A stochastic model for the effects of crystal defects is developed in terms of the Langevin equation which leads to a description of diffraction from imperfect crystals as the evolution of densities in a parameter space, described by a Fokker-Planck equation.

scholarly journals Bursting X-Ray Sources: A Theoretical Framework for Accretion Models

1977 ◽  
Vol 4 (1) ◽  
pp. 125-125
Author(s):  
F.K. Lamb ◽  
A.C. Fabian ◽  
J.E. Pringle ◽  
D. Q. Lamb
Keyword(s):  
Neutron Star ◽  
Theoretical Framework ◽  
Stellar Surface ◽  
Spherically Symmetric ◽  
X Rays ◽  
X Ray ◽  
Accretion Flow

We consider spherically symmetric accretion flow onto a strongly magnetized neutron star. We show that, under certain conditions, the flow is intermittent and that the resultant accretion luminosity (X-rays) from the stellar surface is akin to that observed in the bursting X-ray sources. We investigate the properties of such burst flows under a variety of conditions, in the hopes of providing a basic theoretical framework on which realistic models of the observed bursting sources can be built. This work was supported in part by NSF Grant PHY75-08790.

scholarly journals Radio Constraints of Dark Matter: A Review and Some Future Perspectives

Galaxies ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 11
Author(s):  
Man Ho Chan
Keyword(s):  
Dark Matter ◽  
Gamma Rays ◽  
Theoretical Framework ◽  
X Rays ◽  
Radio Waves ◽  
Future Perspectives ◽  
Dark Matter Annihilation ◽  
Radio Data ◽  
The Past ◽  
Radio Detection

In the past few decades, many studies have analyzed the data of gamma-rays, X-rays, radio waves, electrons, positrons, anti-protons, and neutrinos to search for the signal of dark matter annihilation. In particular, analyzing radio data has been one of the most important and effective ways to constrain dark matter. In this article, we review the physics and the theoretical framework of using radio data to constrain annihilating dark matter. We also review some important radio constraints of annihilating dark matter and discuss the future perspectives of using radio detection to reveal the nature of dark matter.

Nanostructures, Magnetic Materials, Ceramics and Thin Films Probed by X-rays

2003 ◽  
pp. 293-306
Author(s):  
D. L. Ederer ◽  
T. M. Schuler ◽  
S. Itza-Ortiz ◽  
J. Jimenez ◽  
S. Stadler ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Materials ◽  
X Rays

MAGNETIC COUPLING IN THIN LAYERS AND SUPERLATTICES INVESTIGATED BY RESONANT SCATTERING OF POLARIZED SOFT X-RAYS

2002 ◽  
Vol 09 (02) ◽  
pp. 811-820 ◽  
Author(s):  
MAURIZIO SACCHI ◽  
CORYN F. HAGUE
Keyword(s):  
Thin Films ◽  
Magnetic Materials ◽  
Magnetic Coupling ◽  
Resonant Scattering ◽  
Thin Layers ◽  
Multilayer Structures ◽  
X Rays ◽  
Short Overview ◽  
Recent Developments

A short overview is given of recent developments in the use of resonant scattering of polarized soft X-rays to investigate magnetic materials. A few studies are chosen to exemplify possible applications in the field of thin films and ordered multilayer structures.

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