Electron impact polarization of atomic spectral lines. I - A general theoretical scheme

Details Electron impact polarization of atomic spectral lines. I - A general theoretical scheme Electron impact polarization of atomic spectral lines. I - A general theoretical scheme

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..337f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. 337-352.

Astronomy and Astrophysics

Astrophysics

6

Atomic Interactions, Atomic Spectra, Born Approximation, Electron Impact, Inelastic Collisions, Quantum Mechanics, Electric Dipoles, Electron Beams, Hamiltonian Functions, Polarization (Waves), Schroedinger Equation, Zeeman Effect

Scientific paper

A 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.

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