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Electron impact polarization of atomic spectral lines. I - A general theoretical schemeA suitable theoretical scheme able to describe, in a wide variety of astrophysical situations, the phenomenon of atomic line polarization by electron impact is developed. Starting from the general principles of quantum mechanics and assuming the Born approximation, the rate equations for the density matrix elements of a multilevel atomic system, interacting with a nonrelativistic electron beam having any kind of angular distribution, are derived in full generality. The resulting theory generalizes the previous ones by accounting for the collisional rates and the cross sections concerning both inelastic and superelastic collisions (in any geometrical situation), and, moreover, by taking into account the coherences among Zeeman sublevels split by a magnetic field. As an example of particular relevance, the general formulas derived in the first sections of the paper are subsequently particularized to the case of the electric dipole interaction.
Document ID
19920059812
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fineschi, Silvano
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Degl'innocenti, Egidio L.
(Firenze, Universita Florence, Italy)
Date Acquired
August 15, 2013
Publication Date
June 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 392
Issue: 1, Ju
ISSN: 0004-637X
Subject Category
Atomic And Molecular Physics
Accession Number
92A42436
Distribution Limits
Public
Copyright
Other

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