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Optics and Spectroscopy

Effect of a longitudinal strong magnetic field on the polarization characteristics of H α emission

Sergei A. Kazantsev, A. G. Petrashen

Published May 1, 2001• 0 citations
Publisher

Abstract

The effect of the magnetic field whose direction is parallel to the direction of the collision-induced alignment on the polarization characteristics of emission of ensembles of excited particles is considered. Concrete calculations were performed for the emission corresponding to the transitions between the levels of the fine structure of the states of atomic hydrogen with n =3 and n =2.

DOI
10.1134/1.1374648

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The effect of the magnetic field whose direction is parallel to the direction of the collision-induced alignment on the polarization characteristics of emission of ensembles of excited particles is considered. Concrete calculations were performed for the emission corresponding to the transitions between the levels of the fine structure of the states of atomic hydrogen with n =3 and n =2.
The polarization properties of a beam of radiation interacting with a hydrogen atom subject to simultaneous stationary electric and magnetic fields are investigated, assuming no constraints on the direction of the two fields. The problem of determining the energy eigenstates is solved within the theory of Rayleigh-Schrodinger for the stationary perturbations (the contributions of the fine and hyperfine structure of the energy spectrum are also accounted for). Then the polarized transition rates (for absorption, spontaneous emission and stimulated emission) are evaluated according to the methods of non-relativistic quantum electrodynamics, adopting the density matrix formalism which allows one to deal with partially polarized states of the atomic and the radiation field systems
We consider a gas of hydrogen atoms illuminated by a broadband, unpolarized radiation with zero anisotropy. In the absence of external fields, the atomic J-levels are thus isotropically populated. While this condition persists in the presence of a magnetic field, we show instead that electric fields can induce the alignment of those levels. We also show that this electric alignment cannot occur in a two-term model of hydrogen (e.g., if only the Ly-alpha transition is excited), or if the level populations are distributed according to Boltzmann's law.