Induced atomic orientation, an efficient mechanism for magnetic circular polarization

Details Induced atomic orientation, an efficient mechanism for magnetic circular polarization Induced atomic orientation, an efficient mechanism for magnetic circular polarization

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278..863k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 15, 1984, p. 863-873.

Astronomy and Astrophysics

Astrophysics

40

Astrophysics, Atomic Excitations, Circular Polarization, Magnetic Effects, Polarization (Spin Alignment), Zeeman Effect, Eigenvalues, Helium, Mathematical Models, Steady State, Sunspots

Scientific paper

The alignment-orientation process is exactly treated for an alkali-like atom with purely electronic couplings. Analytic expressions for the circular polarization of the optical emission are given for specific types of anisotropic excitation in terms of the magnetic field and the spin-orbit parameter. No advanced formalism is used. It is shown how the hyperfine interaction with the electron orbital motion operates in a manner very similar to the purely electronic spin-orbit coupling, again leading to orbital orientation and to circularly polarized optical emission. Detailed computed results for alignment-orientation conversion for neutral helium are summarized, as are the results of experiments which directly exhibit circularly polarized emission due to the alignment-orientation effect in gases.

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