[PDF] Polarization In Spectral Lines eBook

Author : M. Landi Degl'Innocenti
Publisher : Springer Science & Business Media
Page : 899 pages
File Size : 16,69 MB
Release : 2006-05-17
Category : Science
ISBN : 1402024150

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The scientific research based on spectropolarimetric techniques is undergoing a phase of rapid growth. Instruments of unprecedented sensitivity are nowadays available, particularly for solar observations. To fully exploit the rich diagnostic content of such observations, it is necessary to understand the physical mechanisms involved in the generation and transfer of polarized radiation in astrophysical (or laboratory) plasmas. After an introductory part based on classical physics, this book tackles the subject by a rigorous quantum-mechanical approach. The transfer equations for polarized radiation and the statistical equilibrium equations for the atomic density matrix are derived directly from the principles of Quantum Electrodynamics. The two sets of equations are then used to present a number of applications, mainly concerning the diagnostics of solar magnetic fields. This book is primarily addressed to scientists working in the field of spectropolarimetry. It may also serve as a textbook for a course at the graduate or advanced undergraduate level.

Author : Eugene Oks
Publisher :
Page : 0 pages
File Size : 47,45 MB
Release : 2024-04-02
Category : Science
ISBN : 9780750362832

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The book covers various polarization and directional effects - practically important for diagnostics of plasmas - in the radiation of satellites of spectral lines from plasmas, in the intra-Stark spectroscopy of plasmas, in the Stark broadening of spectral lines by a high-energy hydrogen or deuterium beam, or by a relativistic electron beam in magnetic fusion plasmas, in the Stark broadening of spectral lines in strongly-magnetized plasmas, in the radiation of plasma-based x-ray lasers, and in the laser-induced fluorescence from plasmas.

Author : Jan Olof Stenflo
Publisher : Springer Science & Business Media
Page : 434 pages
File Size : 43,43 MB
Release : 2012-12-06
Category : Science
ISBN : 940090231X

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Much progress has been made in recent years in understanding the complex physics of polarized radiation in the sun and stars. This physics includes vector radiative transfer and spectral line formation in the presence of magnetic fields, scattering theory and coherence effects, partial redistribution and turbulent magnetic fields, numerical techniques and Stokes inversion, as well as concepts for polarimetric imaging with a precision limited only by photon statistics. The present volume gives a comprehensive and up-to-date account of this rapidly evolving field of science.

Author : Jose Carlos del Toro Iniesta
Publisher : Cambridge University Press
Page : 247 pages
File Size : 15,43 MB
Release : 2003-03-06
Category : Science
ISBN : 1139436503

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Spectropolarimetry embraces the most complete and detailed measurement and analysis of light, as well as its interaction with matter. This book provides an introductory overview of the area, which plays an increasingly important role in modern solar observations. Chapters include a comprehensive description of the polarization state of polychromatic light and its measurement, an overview of astronomical (solar) polarimetry, the radiative transfer equation for polarized light, and the formation of spectral lines in the presence of a magnetic field. Most topics are dealt with within the realm of classical physics, although a small amount of quantum mechanics is introduced where necessary. This text will be a valuable reference for graduates and researchers in astrophysics, solar physics and optics.

Author : K.N. Nagendra
Publisher : Springer Science & Business Media
Page : 553 pages
File Size : 34,19 MB
Release : 2013-03-09
Category : Science
ISBN : 9401593299

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Novel instruments for high-precision imaging polarimetry have opened new possibilities, including for exploring effects in radiative scattering, atomic physics, spectral line formation, and radiative transfer. This volume gives a comprehensive and up-to-date account of this rapidly evolving and interdisciplinary field of science.

Author :
Publisher :
Page : pages
File Size : 30,4 MB
Release : 2008
Category :
ISBN :

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We apply the magnetic-sublevel atomic kinetics model POLAR to the calculation of polarization properties of satellite lines in Li-like Si driven by subpicosecond-duration laser pulses. We identify spectral lines whose polarization can serve as a marker of plasma anisotropy due to anisotropy in the electron distribution function. We also discuss the utility and limitations of ur current theoretical approach and point out possible future improvements and directions.

Author :
Publisher :
Page : 10 pages
File Size : 45,49 MB
Release : 2004
Category :
ISBN :

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We discuss the mechanism of polarized X-ray line emission in plasmas, its connection to plasma anisotropy, and introduce an atomic kinetics model and code (POLAR) based on the population kinetics of magnetic sublevels. POLAR represents a multi-level, multi-process approach to the problem of polarized spectra in plasmas, and hence it is well suited for plasma applications where cascade effects and alignment transfer can become important. Polarization degrees of X-ray spectral lines computed with POLAR were successfully benchmarked against calculations done with other formalisms, and experimental results obtained at the EBIT facility of Lawrence Livermore National Laboratory. We also investigated the polarization of He-like Si X-ray satellite lines as spectral signatures of anisotropy in the electron distribution function. A comprehensive modeling study was performed taking into account hydrodynamics and electron kinetics. We find that two satellite lines connecting singlet states develop a noticeable polarization while the triplet lines remain unpolarized. These results suggest a scenario where triplet lines could be used as a reference while the singlets could be used as polarized markers of plasma anisotropy.